i18n: rebase-interactive: mark comments of squash for translation
[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;
d288a700 8
46c3cd44
JK
9static struct startup_info the_startup_info;
10struct startup_info *startup_info = &the_startup_info;
11
ddc2a628
MEW
12/*
13 * The input parameter must contain an absolute path, and it must already be
14 * normalized.
15 *
16 * Find the part of an absolute path that lies inside the work tree by
17 * dereferencing symlinks outside the work tree, for example:
18 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
19 * /dir/file (work tree is /) -> dir/file
20 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
21 * /dir/repolink/file (repolink points to /dir/repo) -> file
22 * /dir/repo (exactly equal to work tree) -> (empty string)
23 */
24static int abspath_part_inside_repo(char *path)
25{
26 size_t len;
27 size_t wtlen;
28 char *path0;
29 int off;
30 const char *work_tree = get_git_work_tree();
31
32 if (!work_tree)
33 return -1;
34 wtlen = strlen(work_tree);
35 len = strlen(path);
6127ff63 36 off = offset_1st_component(path);
ddc2a628
MEW
37
38 /* check if work tree is already the prefix */
39 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
40 if (path[wtlen] == '/') {
41 memmove(path, path + wtlen + 1, len - wtlen);
42 return 0;
43 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
44 /* work tree is the root, or the whole path */
45 memmove(path, path + wtlen, len - wtlen + 1);
46 return 0;
47 }
48 /* work tree might match beginning of a symlink to work tree */
49 off = wtlen;
50 }
51 path0 = path;
6127ff63 52 path += off;
ddc2a628
MEW
53
54 /* check each '/'-terminated level */
55 while (*path) {
56 path++;
57 if (*path == '/') {
58 *path = '\0';
59 if (strcmp(real_path(path0), work_tree) == 0) {
60 memmove(path0, path + 1, len - (path - path0));
61 return 0;
62 }
63 *path = '/';
64 }
65 }
66
67 /* check whole path */
68 if (strcmp(real_path(path0), work_tree) == 0) {
69 *path0 = '\0';
70 return 0;
71 }
72
73 return -1;
74}
75
645a29c4
NTND
76/*
77 * Normalize "path", prepending the "prefix" for relative paths. If
78 * remaining_prefix is not NULL, return the actual prefix still
79 * remains in the path. For example, prefix = sub1/sub2/ and path is
80 *
81 * foo -> sub1/sub2/foo (full prefix)
82 * ../foo -> sub1/foo (remaining prefix is sub1/)
83 * ../../bar -> bar (no remaining prefix)
84 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
85 * `pwd`/../bar -> sub1/bar (no remaining prefix)
86 */
87char *prefix_path_gently(const char *prefix, int len,
88 int *remaining_prefix, const char *path)
d089ebaa
JH
89{
90 const char *orig = path;
18e051a3
CMAB
91 char *sanitized;
92 if (is_absolute_path(orig)) {
3733e694 93 sanitized = xmallocz(strlen(path));
645a29c4
NTND
94 if (remaining_prefix)
95 *remaining_prefix = 0;
655ee9ea
MEW
96 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
97 free(sanitized);
98 return NULL;
99 }
100 if (abspath_part_inside_repo(sanitized)) {
101 free(sanitized);
102 return NULL;
103 }
18e051a3 104 } else {
24041d6b 105 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
645a29c4
NTND
106 if (remaining_prefix)
107 *remaining_prefix = len;
655ee9ea 108 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
109 free(sanitized);
110 return NULL;
d089ebaa 111 }
d089ebaa
JH
112 }
113 return sanitized;
f332726e
LT
114}
115
546e0fd9
JK
116char *prefix_path(const char *prefix, int len, const char *path)
117{
645a29c4 118 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
119 if (!r)
120 die("'%s' is outside repository", path);
121 return r;
122}
123
124int path_inside_repo(const char *prefix, const char *path)
125{
126 int len = prefix ? strlen(prefix) : 0;
645a29c4 127 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
128 if (r) {
129 free(r);
130 return 1;
131 }
132 return 0;
133}
134
c6e8c800
JH
135int check_filename(const char *prefix, const char *arg)
136{
137 const char *name;
138 struct stat st;
139
59556548 140 if (starts_with(arg, ":/")) {
4db86e8b
NTND
141 if (arg[2] == '\0') /* ":/" is root dir, always exists */
142 return 1;
143 name = arg + 2;
df714f81 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);
df714f81 205 if (check_filename(prefix, arg) || !no_wildcard(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
ffd036b1
JK
315int is_nonbare_repository_dir(struct strbuf *path)
316{
317 int ret = 0;
318 int gitfile_error;
319 size_t orig_path_len = path->len;
320 assert(orig_path_len != 0);
321 strbuf_complete(path, '/');
322 strbuf_addstr(path, ".git");
323 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
324 ret = 1;
325 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
326 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
327 ret = 1;
328 strbuf_setlen(path, orig_path_len);
329 return ret;
330}
331
68025633
JS
332int is_inside_git_dir(void)
333{
e90fdc39
JS
334 if (inside_git_dir < 0)
335 inside_git_dir = is_inside_dir(get_git_dir());
336 return inside_git_dir;
892c41b9
ML
337}
338
892c41b9
ML
339int is_inside_work_tree(void)
340{
e90fdc39
JS
341 if (inside_work_tree < 0)
342 inside_work_tree = is_inside_dir(get_git_work_tree());
343 return inside_work_tree;
892c41b9
ML
344}
345
f3fa1838
JH
346void setup_work_tree(void)
347{
354e6534
JS
348 const char *work_tree, *git_dir;
349 static int initialized = 0;
350
351 if (initialized)
352 return;
fada7674
JK
353
354 if (work_tree_config_is_bogus)
355 die("unable to set up work tree using invalid config");
356
354e6534
JS
357 work_tree = get_git_work_tree();
358 git_dir = get_git_dir();
59f0f2f3 359 if (!is_absolute_path(git_dir))
e2a57aac 360 git_dir = real_path(get_git_dir());
59f0f2f3
MH
361 if (!work_tree || chdir(work_tree))
362 die("This operation must be run in a work tree");
0ed74813
NTND
363
364 /*
365 * Make sure subsequent git processes find correct worktree
366 * if $GIT_WORK_TREE is set relative
367 */
368 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
369 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
370
41894ae3 371 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 372 initialized = 1;
59f0f2f3
MH
373}
374
2cc7c2c7 375static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 376{
2cc7c2c7 377 struct repository_format *data = vdata;
00a09d57
JK
378 const char *ext;
379
31e26ebc 380 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 381 data->version = git_config_int(var, value);
00a09d57
JK
382 else if (skip_prefix(var, "extensions.", &ext)) {
383 /*
384 * record any known extensions here; otherwise,
385 * we fall through to recording it as unknown, and
386 * check_repository_format will complain
387 */
388 if (!strcmp(ext, "noop"))
389 ;
067fbd41 390 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 391 data->precious_objects = git_config_bool(var, value);
00a09d57 392 else
2cc7c2c7 393 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
394 } else if (strcmp(var, "core.bare") == 0) {
395 data->is_bare = git_config_bool(var, value);
396 } else if (strcmp(var, "core.worktree") == 0) {
397 if (!value)
398 return config_error_nonbool(var);
399 data->work_tree = xstrdup(value);
00a09d57 400 }
31e26ebc
NTND
401 return 0;
402}
403
337e51ce 404static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 405{
7d0fb0da 406 struct strbuf sb = STRBUF_INIT;
2cc7c2c7
JK
407 struct strbuf err = STRBUF_INIT;
408 struct repository_format candidate;
652f18ee 409 int has_common;
00a09d57 410
652f18ee 411 has_common = get_common_dir(&sb, gitdir);
e61a509a 412 strbuf_addstr(&sb, "/config");
652f18ee 413 read_repository_format(&candidate, sb.buf);
2cc7c2c7 414 strbuf_release(&sb);
e61a509a 415
337e51ce 416 /*
2cc7c2c7
JK
417 * For historical use of check_repository_format() in git-init,
418 * we treat a missing config as a silent "ok", even when nongit_ok
419 * is unset.
337e51ce 420 */
2cc7c2c7
JK
421 if (candidate.version < 0)
422 return 0;
423
424 if (verify_repository_format(&candidate, &err) < 0) {
425 if (nongit_ok) {
426 warning("%s", err.buf);
427 strbuf_release(&err);
428 *nongit_ok = -1;
429 return -1;
430 }
431 die("%s", err.buf);
432 }
433
2cc7c2c7
JK
434 repository_format_precious_objects = candidate.precious_objects;
435 string_list_clear(&candidate.unknown_extensions, 0);
652f18ee
JK
436 if (!has_common) {
437 if (candidate.is_bare != -1) {
438 is_bare_repository_cfg = candidate.is_bare;
439 if (is_bare_repository_cfg == 1)
440 inside_work_tree = -1;
441 }
442 if (candidate.work_tree) {
443 free(git_work_tree_cfg);
444 git_work_tree_cfg = candidate.work_tree;
2cc7c2c7 445 inside_work_tree = -1;
652f18ee
JK
446 }
447 } else {
448 free(candidate.work_tree);
2cc7c2c7
JK
449 }
450
451 return 0;
452}
453
652f18ee 454int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
455{
456 memset(format, 0, sizeof(*format));
457 format->version = -1;
458 format->is_bare = -1;
459 string_list_init(&format->unknown_extensions, 1);
652f18ee 460 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
461 return format->version;
462}
463
2cc7c2c7
JK
464int verify_repository_format(const struct repository_format *format,
465 struct strbuf *err)
466{
467 if (GIT_REPO_VERSION_READ < format->version) {
274db840 468 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
469 GIT_REPO_VERSION_READ, format->version);
470 return -1;
471 }
472
473 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
474 int i;
475
274db840 476 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 477
2cc7c2c7
JK
478 for (i = 0; i < format->unknown_extensions.nr; i++)
479 strbuf_addf(err, "\n\t%s",
480 format->unknown_extensions.items[i].string);
481 return -1;
00a09d57
JK
482 }
483
2cc7c2c7 484 return 0;
9459aa77
NTND
485}
486
b44ebb19
LH
487/*
488 * Try to read the location of the git directory from the .git file,
489 * return path to git directory if found.
a93bedad
EE
490 *
491 * On failure, if return_error_code is not NULL, return_error_code
492 * will be set to an error code and NULL will be returned. If
493 * return_error_code is NULL the function will die instead (for most
494 * cases).
b44ebb19 495 */
a93bedad 496const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 497{
921bdd96 498 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
499 int error_code = 0;
500 char *buf = NULL;
501 char *dir = NULL;
40c813e0 502 const char *slash;
b44ebb19
LH
503 struct stat st;
504 int fd;
b1905aea 505 ssize_t len;
b44ebb19 506
a93bedad
EE
507 if (stat(path, &st)) {
508 error_code = READ_GITFILE_ERR_STAT_FAILED;
509 goto cleanup_return;
510 }
511 if (!S_ISREG(st.st_mode)) {
512 error_code = READ_GITFILE_ERR_NOT_A_FILE;
513 goto cleanup_return;
514 }
921bdd96
EE
515 if (st.st_size > max_file_size) {
516 error_code = READ_GITFILE_ERR_TOO_LARGE;
517 goto cleanup_return;
518 }
b44ebb19 519 fd = open(path, O_RDONLY);
a93bedad
EE
520 if (fd < 0) {
521 error_code = READ_GITFILE_ERR_OPEN_FAILED;
522 goto cleanup_return;
523 }
3733e694 524 buf = xmallocz(st.st_size);
b44ebb19
LH
525 len = read_in_full(fd, buf, st.st_size);
526 close(fd);
a93bedad
EE
527 if (len != st.st_size) {
528 error_code = READ_GITFILE_ERR_READ_FAILED;
529 goto cleanup_return;
530 }
a93bedad
EE
531 if (!starts_with(buf, "gitdir: ")) {
532 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
533 goto cleanup_return;
534 }
b44ebb19
LH
535 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
536 len--;
a93bedad
EE
537 if (len < 9) {
538 error_code = READ_GITFILE_ERR_NO_PATH;
539 goto cleanup_return;
540 }
b44ebb19 541 buf[len] = '\0';
40c813e0
BK
542 dir = buf + 8;
543
544 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
545 size_t pathlen = slash+1 - path;
75faa45a
JK
546 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
547 (int)(len - 8), buf + 8);
40c813e0
BK
548 free(buf);
549 buf = dir;
550 }
a93bedad
EE
551 if (!is_git_directory(dir)) {
552 error_code = READ_GITFILE_ERR_NOT_A_REPO;
553 goto cleanup_return;
554 }
e2a57aac 555 path = real_path(dir);
40c813e0 556
a93bedad 557cleanup_return:
a93bedad
EE
558 if (return_error_code)
559 *return_error_code = error_code;
38ae8784 560 else if (error_code) {
a93bedad
EE
561 switch (error_code) {
562 case READ_GITFILE_ERR_STAT_FAILED:
563 case READ_GITFILE_ERR_NOT_A_FILE:
38ae8784
JK
564 /* non-fatal; follow return path */
565 break;
a93bedad
EE
566 case READ_GITFILE_ERR_OPEN_FAILED:
567 die_errno("Error opening '%s'", path);
921bdd96
EE
568 case READ_GITFILE_ERR_TOO_LARGE:
569 die("Too large to be a .git file: '%s'", path);
a93bedad
EE
570 case READ_GITFILE_ERR_READ_FAILED:
571 die("Error reading %s", path);
572 case READ_GITFILE_ERR_INVALID_FORMAT:
573 die("Invalid gitfile format: %s", path);
574 case READ_GITFILE_ERR_NO_PATH:
575 die("No path in gitfile: %s", path);
576 case READ_GITFILE_ERR_NOT_A_REPO:
577 die("Not a git repository: %s", dir);
578 default:
579 assert(0);
580 }
581 }
582
b44ebb19 583 free(buf);
38ae8784 584 return error_code ? NULL : path;
b44ebb19
LH
585}
586
e4e30347 587static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 588 struct strbuf *cwd,
b3f66fd3 589 int *nongit_ok)
e4e30347 590{
b3f66fd3
NTND
591 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
592 const char *worktree;
593 char *gitfile;
9b125da4 594 int offset;
e4e30347
JN
595
596 if (PATH_MAX - 40 < strlen(gitdirenv))
597 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 598
13d6ec91 599 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
600 if (gitfile) {
601 gitfile = xstrdup(gitfile);
602 gitdirenv = gitfile;
603 }
604
e4e30347
JN
605 if (!is_git_directory(gitdirenv)) {
606 if (nongit_ok) {
607 *nongit_ok = 1;
b3f66fd3 608 free(gitfile);
e4e30347
JN
609 return NULL;
610 }
611 die("Not a git repository: '%s'", gitdirenv);
612 }
b3f66fd3
NTND
613
614 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
615 free(gitfile);
616 return NULL;
e4e30347 617 }
b3f66fd3
NTND
618
619 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
620 if (work_tree_env)
621 set_git_work_tree(work_tree_env);
622 else if (is_bare_repository_cfg > 0) {
fada7674
JK
623 if (git_work_tree_cfg) {
624 /* #22.2, #30 */
625 warning("core.bare and core.worktree do not make sense");
626 work_tree_config_is_bogus = 1;
627 }
b3f66fd3
NTND
628
629 /* #18, #26 */
630 set_git_dir(gitdirenv);
631 free(gitfile);
e4e30347 632 return NULL;
b3f66fd3
NTND
633 }
634 else if (git_work_tree_cfg) { /* #6, #14 */
635 if (is_absolute_path(git_work_tree_cfg))
636 set_git_work_tree(git_work_tree_cfg);
637 else {
56b9f6e7 638 char *core_worktree;
b3f66fd3
NTND
639 if (chdir(gitdirenv))
640 die_errno("Could not chdir to '%s'", gitdirenv);
641 if (chdir(git_work_tree_cfg))
642 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 643 core_worktree = xgetcwd();
7333ed17 644 if (chdir(cwd->buf))
b3f66fd3
NTND
645 die_errno("Could not come back to cwd");
646 set_git_work_tree(core_worktree);
56b9f6e7 647 free(core_worktree);
b3f66fd3
NTND
648 }
649 }
2cd83d10
JK
650 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
651 /* #16d */
652 set_git_dir(gitdirenv);
653 free(gitfile);
654 return NULL;
655 }
b3f66fd3
NTND
656 else /* #2, #10 */
657 set_git_work_tree(".");
658
659 /* set_git_work_tree() must have been called by now */
660 worktree = get_git_work_tree();
661
662 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 663 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
664 set_git_dir(gitdirenv);
665 free(gitfile);
e4e30347 666 return NULL;
b3f66fd3 667 }
e4e30347 668
7333ed17 669 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 670 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 671 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
672 if (chdir(worktree))
673 die_errno("Could not chdir to '%s'", worktree);
7333ed17 674 strbuf_addch(cwd, '/');
b3f66fd3 675 free(gitfile);
7333ed17 676 return cwd->buf + offset;
93a00542 677 }
b3f66fd3
NTND
678
679 /* cwd outside worktree */
680 set_git_dir(gitdirenv);
681 free(gitfile);
682 return NULL;
93a00542
JN
683}
684
9951d3b3 685static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 686 struct strbuf *cwd, int offset,
9951d3b3 687 int *nongit_ok)
98937bef 688{
9951d3b3
NTND
689 if (check_repository_format_gently(gitdir, nongit_ok))
690 return NULL;
98937bef 691
4868b2ea
JN
692 /* --work-tree is set without --git-dir; use discovered one */
693 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 694 if (offset != cwd->len && !is_absolute_path(gitdir))
e2a57aac 695 gitdir = xstrdup(real_path(gitdir));
7333ed17 696 if (chdir(cwd->buf))
4868b2ea 697 die_errno("Could not come back to cwd");
7333ed17 698 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
699 }
700
9951d3b3
NTND
701 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
702 if (is_bare_repository_cfg > 0) {
7333ed17
RS
703 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
704 if (chdir(cwd->buf))
9951d3b3 705 die_errno("Could not come back to cwd");
98937bef 706 return NULL;
9951d3b3 707 }
98937bef 708
9951d3b3
NTND
709 /* #0, #1, #5, #8, #9, #12, #13 */
710 set_git_work_tree(".");
711 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
712 set_git_dir(gitdir);
98937bef 713 inside_git_dir = 0;
9951d3b3 714 inside_work_tree = 1;
7333ed17 715 if (offset == cwd->len)
98937bef
NTND
716 return NULL;
717
718 /* Make "offset" point to past the '/', and add a '/' at the end */
719 offset++;
7333ed17
RS
720 strbuf_addch(cwd, '/');
721 return cwd->buf + offset;
98937bef
NTND
722}
723
1cd8031b 724/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
725static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
726 int *nongit_ok)
68698da5
JN
727{
728 int root_len;
729
1cd8031b
NTND
730 if (check_repository_format_gently(".", nongit_ok))
731 return NULL;
732
2cd83d10
JK
733 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
734
4868b2ea
JN
735 /* --work-tree is set without --git-dir; use discovered one */
736 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
737 const char *gitdir;
738
7333ed17
RS
739 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
740 if (chdir(cwd->buf))
4868b2ea 741 die_errno("Could not come back to cwd");
7333ed17 742 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
743 }
744
68698da5 745 inside_git_dir = 1;
1cd8031b 746 inside_work_tree = 0;
7333ed17
RS
747 if (offset != cwd->len) {
748 if (chdir(cwd->buf))
8fc0ae80 749 die_errno("Cannot come back to cwd");
7333ed17
RS
750 root_len = offset_1st_component(cwd->buf);
751 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
752 set_git_dir(cwd->buf);
337e51ce 753 }
1cd8031b 754 else
68698da5 755 set_git_dir(".");
68698da5
JN
756 return NULL;
757}
758
f161edeb
JN
759static const char *setup_nongit(const char *cwd, int *nongit_ok)
760{
761 if (!nongit_ok)
762 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
763 if (chdir(cwd))
764 die_errno("Cannot come back to cwd");
765 *nongit_ok = 1;
766 return NULL;
767}
768
2565b43b 769static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
770{
771 struct stat buf;
2565b43b
CB
772 if (stat(path, &buf)) {
773 die_errno("failed to stat '%*s%s%s'",
774 prefix_len,
60c98d1e
JN
775 prefix ? prefix : "",
776 prefix ? "/" : "", path);
2565b43b 777 }
60c98d1e
JN
778 return buf.st_dev;
779}
780
9e2326c7 781/*
1b77d83c
MH
782 * A "string_list_each_func_t" function that canonicalizes an entry
783 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
784 * discards it if unusable. The presence of an empty entry in
785 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
786 * subsequent entries.
9e2326c7 787 */
1b77d83c 788static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 789 void *cb_data)
9e2326c7 790{
7ec30aaa 791 int *empty_entry_found = cb_data;
1b77d83c 792 char *ceil = item->string;
9e2326c7 793
7ec30aaa
MH
794 if (!*ceil) {
795 *empty_entry_found = 1;
9e2326c7 796 return 0;
7ec30aaa 797 } else if (!is_absolute_path(ceil)) {
9e2326c7 798 return 0;
7ec30aaa
MH
799 } else if (*empty_entry_found) {
800 /* Keep entry but do not canonicalize it */
801 return 1;
802 } else {
803 const char *real_path = real_path_if_valid(ceil);
804 if (!real_path)
805 return 0;
806 free(item->string);
807 item->string = xstrdup(real_path);
808 return 1;
809 }
9e2326c7
MH
810}
811
e90fdc39
JS
812/*
813 * We cannot decide in this function whether we are in the work tree or
814 * not, since the config can only be read _after_ this function was called.
815 */
a60645f9 816static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 817{
0454dd93 818 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 819 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
7333ed17 820 static struct strbuf cwd = STRBUF_INIT;
9951d3b3
NTND
821 const char *gitdirenv, *ret;
822 char *gitfile;
7333ed17 823 int offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
824 dev_t current_device = 0;
825 int one_filesystem = 1;
d288a700 826
3c8687a7
TA
827 /*
828 * We may have read an incomplete configuration before
829 * setting-up the git directory. If so, clear the cache so
830 * that the next queries to the configuration reload complete
831 * configuration (including the per-repo config file that we
832 * ignored previously).
833 */
834 git_config_clear();
835
af05d679
SG
836 /*
837 * Let's assume that we are in a git repository.
838 * If it turns out later that we are somewhere else, the value will be
839 * updated accordingly.
840 */
841 if (nongit_ok)
842 *nongit_ok = 0;
843
7333ed17 844 if (strbuf_getcwd(&cwd))
b3f66fd3 845 die_errno("Unable to read current working directory");
7333ed17 846 offset = cwd.len;
b3f66fd3 847
e90fdc39
JS
848 /*
849 * If GIT_DIR is set explicitly, we're not going
850 * to do any discovery, but we still do repository
851 * validation.
852 */
ad1a382f 853 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 854 if (gitdirenv)
7333ed17 855 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
d288a700 856
31171d9e 857 if (env_ceiling_dirs) {
7ec30aaa
MH
858 int empty_entry_found = 0;
859
31171d9e 860 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 861 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 862 canonicalize_ceiling_entry, &empty_entry_found);
7333ed17 863 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
31171d9e
MH
864 string_list_clear(&ceiling_dirs, 0);
865 }
866
7333ed17 867 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
17d778e7 868 ceil_offset = 1;
d288a700 869
892c41b9 870 /*
e90fdc39 871 * Test in the following order (relative to the cwd):
b44ebb19 872 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
873 * - .git/
874 * - ./ (bare)
b44ebb19 875 * - ../.git
e90fdc39
JS
876 * - ../.git/
877 * - ../ (bare)
878 * - ../../.git/
879 * etc.
892c41b9 880 */
cf87463e 881 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 882 if (one_filesystem)
2565b43b 883 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 884 for (;;) {
13d6ec91 885 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
886 if (gitfile)
887 gitdirenv = gitfile = xstrdup(gitfile);
888 else {
889 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
890 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
891 }
892
893 if (gitdirenv) {
894 ret = setup_discovered_git_dir(gitdirenv,
7333ed17 895 &cwd, offset,
9951d3b3
NTND
896 nongit_ok);
897 free(gitfile);
898 return ret;
899 }
900 free(gitfile);
901
68698da5 902 if (is_git_directory("."))
7333ed17 903 return setup_bare_git_dir(&cwd, offset, nongit_ok);
1cd8031b 904
2565b43b 905 offset_parent = offset;
7333ed17 906 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
2565b43b 907 if (offset_parent <= ceil_offset)
7333ed17 908 return setup_nongit(cwd.buf, nongit_ok);
8030e442 909 if (one_filesystem) {
7333ed17
RS
910 dev_t parent_device = get_device_or_die("..", cwd.buf,
911 offset);
60c98d1e 912 if (parent_device != current_device) {
8030e442 913 if (nongit_ok) {
7333ed17 914 if (chdir(cwd.buf))
8030e442
LD
915 die_errno("Cannot come back to cwd");
916 *nongit_ok = 1;
917 return NULL;
918 }
7333ed17 919 strbuf_setlen(&cwd, offset);
2565b43b 920 die("Not a git repository (or any parent up to mount point %s)\n"
7333ed17
RS
921 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
922 cwd.buf);
8030e442
LD
923 }
924 }
502ffe34 925 if (chdir("..")) {
7333ed17
RS
926 strbuf_setlen(&cwd, offset);
927 die_errno("Cannot change to '%s/..'", cwd.buf);
502ffe34 928 }
2565b43b 929 offset = offset_parent;
892c41b9 930 }
d288a700 931}
5e7bfe25 932
a60645f9
NTND
933const char *setup_git_directory_gently(int *nongit_ok)
934{
935 const char *prefix;
936
937 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 938 if (prefix)
a6f7f9a3 939 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 940 else
a6f7f9a3 941 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 942
46c3cd44
JK
943 startup_info->have_repository = !nongit_ok || !*nongit_ok;
944 startup_info->prefix = prefix;
945
a60645f9
NTND
946 return prefix;
947}
948
94df2506
JH
949int git_config_perm(const char *var, const char *value)
950{
06cbe855
HO
951 int i;
952 char *endptr;
953
954 if (value == NULL)
955 return PERM_GROUP;
956
957 if (!strcmp(value, "umask"))
958 return PERM_UMASK;
959 if (!strcmp(value, "group"))
960 return PERM_GROUP;
961 if (!strcmp(value, "all") ||
962 !strcmp(value, "world") ||
963 !strcmp(value, "everybody"))
964 return PERM_EVERYBODY;
965
966 /* Parse octal numbers */
967 i = strtol(value, &endptr, 8);
968
969 /* If not an octal number, maybe true/false? */
970 if (*endptr != 0)
971 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
972
973 /*
974 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 975 * a chmod value to restrict to.
06cbe855
HO
976 */
977 switch (i) {
978 case PERM_UMASK: /* 0 */
979 return PERM_UMASK;
980 case OLD_PERM_GROUP: /* 1 */
981 return PERM_GROUP;
982 case OLD_PERM_EVERYBODY: /* 2 */
983 return PERM_EVERYBODY;
94df2506 984 }
06cbe855
HO
985
986 /* A filemode value was given: 0xxx */
987
988 if ((i & 0600) != 0600)
989 die("Problem with core.sharedRepository filemode value "
990 "(0%.3o).\nThe owner of files must always have "
991 "read and write permissions.", i);
992
993 /*
994 * Mask filemode value. Others can not get write permission.
995 * x flags for directories are handled separately.
996 */
5a688fe4 997 return -(i & 0666);
94df2506
JH
998}
999
4b0d1eeb 1000void check_repository_format(void)
ab9cb76f 1001{
f1c126bd
JK
1002 check_repository_format_gently(get_git_dir(), NULL);
1003 startup_info->have_repository = 1;
ab9cb76f
JH
1004}
1005
e1e5ec86
CB
1006/*
1007 * Returns the "prefix", a path to the current working directory
1008 * relative to the work tree root, or NULL, if the current working
1009 * directory is not a strict subdirectory of the work tree root. The
1010 * prefix always ends with a '/' character.
1011 */
5e7bfe25
JH
1012const char *setup_git_directory(void)
1013{
b3f66fd3 1014 return setup_git_directory_gently(NULL);
5e7bfe25 1015}
abc06822
FG
1016
1017const char *resolve_gitdir(const char *suspect)
1018{
1019 if (is_git_directory(suspect))
1020 return suspect;
efc5fb6a 1021 return read_gitfile(suspect);
abc06822 1022}
1d999ddd
TR
1023
1024/* if any standard file descriptor is missing open it to /dev/null */
1025void sanitize_stdfds(void)
1026{
1027 int fd = open("/dev/null", O_RDWR, 0);
1028 while (fd != -1 && fd < 2)
1029 fd = dup(fd);
1030 if (fd == -1)
1031 die_errno("open /dev/null or dup failed");
1032 if (fd > 2)
1033 close(fd);
1034}
de0957ce
NTND
1035
1036int daemonize(void)
1037{
1038#ifdef NO_POSIX_GOODIES
1039 errno = ENOSYS;
1040 return -1;
1041#else
1042 switch (fork()) {
1043 case 0:
1044 break;
1045 case -1:
1046 die_errno("fork failed");
1047 default:
1048 exit(0);
1049 }
1050 if (setsid() == -1)
1051 die_errno("setsid failed");
1052 close(0);
1053 close(1);
1054 close(2);
1055 sanitize_stdfds();
1056 return 0;
1057#endif
1058}