setup: prepare setup_discovered_git_dir() for the root directory
[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 159 if (!diagnose_misspelt_rev)
ab33a76e
VA
160 die(_("%s: no such path in the working tree.\n"
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 172 /* ... or fall back the most general message. */
ab33a76e
VA
173 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
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;
ab33a76e
VA
223 die(_("ambiguous argument '%s': both revision and filename\n"
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;
4ac9006f 259 } else {
4dc4e145 260 strbuf_addstr(sb, gitdir);
4ac9006f
BW
261 }
262
4dc4e145
NTND
263 strbuf_release(&data);
264 strbuf_release(&path);
31e26ebc 265 return ret;
4dc4e145 266}
d288a700 267
5f5608bc 268/*
ad1a382f 269 * Test if it looks like we're at a git directory.
5e7bfe25 270 * We want to see:
5f5608bc 271 *
790296fd 272 * - either an objects/ directory _or_ the proper
5f5608bc 273 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 274 * - a refs/ directory
8098a178 275 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
276 * a proper "ref:", or a regular file HEAD that has a properly
277 * formatted sha1 object name.
5f5608bc 278 */
b3256eb8 279int is_git_directory(const char *suspect)
5f5608bc 280{
1d186b6f
NTND
281 struct strbuf path = STRBUF_INIT;
282 int ret = 0;
283 size_t len;
ad1a382f 284
4dc4e145
NTND
285 /* Check worktree-related signatures */
286 strbuf_addf(&path, "%s/HEAD", suspect);
287 if (validate_headref(path.buf))
288 goto done;
289
290 strbuf_reset(&path);
291 get_common_dir(&path, suspect);
1d186b6f 292 len = path.len;
4dc4e145
NTND
293
294 /* Check non-worktree-related signatures */
ad1a382f
SP
295 if (getenv(DB_ENVIRONMENT)) {
296 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 297 goto done;
ad1a382f
SP
298 }
299 else {
4dc4e145 300 strbuf_setlen(&path, len);
1d186b6f
NTND
301 strbuf_addstr(&path, "/objects");
302 if (access(path.buf, X_OK))
303 goto done;
ad1a382f
SP
304 }
305
1d186b6f
NTND
306 strbuf_setlen(&path, len);
307 strbuf_addstr(&path, "/refs");
308 if (access(path.buf, X_OK))
309 goto done;
ad1a382f 310
1d186b6f
NTND
311 ret = 1;
312done:
313 strbuf_release(&path);
314 return ret;
5f5608bc
LT
315}
316
ffd036b1
JK
317int is_nonbare_repository_dir(struct strbuf *path)
318{
319 int ret = 0;
320 int gitfile_error;
321 size_t orig_path_len = path->len;
322 assert(orig_path_len != 0);
323 strbuf_complete(path, '/');
324 strbuf_addstr(path, ".git");
325 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
326 ret = 1;
327 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
328 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
329 ret = 1;
330 strbuf_setlen(path, orig_path_len);
331 return ret;
332}
333
68025633
JS
334int is_inside_git_dir(void)
335{
e90fdc39
JS
336 if (inside_git_dir < 0)
337 inside_git_dir = is_inside_dir(get_git_dir());
338 return inside_git_dir;
892c41b9
ML
339}
340
892c41b9
ML
341int is_inside_work_tree(void)
342{
e90fdc39
JS
343 if (inside_work_tree < 0)
344 inside_work_tree = is_inside_dir(get_git_work_tree());
345 return inside_work_tree;
892c41b9
ML
346}
347
f3fa1838
JH
348void setup_work_tree(void)
349{
354e6534
JS
350 const char *work_tree, *git_dir;
351 static int initialized = 0;
352
353 if (initialized)
354 return;
fada7674
JK
355
356 if (work_tree_config_is_bogus)
357 die("unable to set up work tree using invalid config");
358
354e6534
JS
359 work_tree = get_git_work_tree();
360 git_dir = get_git_dir();
59f0f2f3 361 if (!is_absolute_path(git_dir))
e2a57aac 362 git_dir = real_path(get_git_dir());
59f0f2f3
MH
363 if (!work_tree || chdir(work_tree))
364 die("This operation must be run in a work tree");
0ed74813
NTND
365
366 /*
367 * Make sure subsequent git processes find correct worktree
368 * if $GIT_WORK_TREE is set relative
369 */
370 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
371 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
372
41894ae3 373 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 374 initialized = 1;
59f0f2f3
MH
375}
376
2cc7c2c7 377static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 378{
2cc7c2c7 379 struct repository_format *data = vdata;
00a09d57
JK
380 const char *ext;
381
31e26ebc 382 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 383 data->version = git_config_int(var, value);
00a09d57
JK
384 else if (skip_prefix(var, "extensions.", &ext)) {
385 /*
386 * record any known extensions here; otherwise,
387 * we fall through to recording it as unknown, and
388 * check_repository_format will complain
389 */
390 if (!strcmp(ext, "noop"))
391 ;
067fbd41 392 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 393 data->precious_objects = git_config_bool(var, value);
00a09d57 394 else
2cc7c2c7 395 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
396 } else if (strcmp(var, "core.bare") == 0) {
397 data->is_bare = git_config_bool(var, value);
398 } else if (strcmp(var, "core.worktree") == 0) {
399 if (!value)
400 return config_error_nonbool(var);
401 data->work_tree = xstrdup(value);
00a09d57 402 }
31e26ebc
NTND
403 return 0;
404}
405
337e51ce 406static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 407{
7d0fb0da 408 struct strbuf sb = STRBUF_INIT;
2cc7c2c7
JK
409 struct strbuf err = STRBUF_INIT;
410 struct repository_format candidate;
652f18ee 411 int has_common;
00a09d57 412
652f18ee 413 has_common = get_common_dir(&sb, gitdir);
e61a509a 414 strbuf_addstr(&sb, "/config");
652f18ee 415 read_repository_format(&candidate, sb.buf);
2cc7c2c7 416 strbuf_release(&sb);
e61a509a 417
337e51ce 418 /*
2cc7c2c7
JK
419 * For historical use of check_repository_format() in git-init,
420 * we treat a missing config as a silent "ok", even when nongit_ok
421 * is unset.
337e51ce 422 */
2cc7c2c7
JK
423 if (candidate.version < 0)
424 return 0;
425
426 if (verify_repository_format(&candidate, &err) < 0) {
427 if (nongit_ok) {
428 warning("%s", err.buf);
429 strbuf_release(&err);
430 *nongit_ok = -1;
431 return -1;
432 }
433 die("%s", err.buf);
434 }
435
2cc7c2c7
JK
436 repository_format_precious_objects = candidate.precious_objects;
437 string_list_clear(&candidate.unknown_extensions, 0);
652f18ee
JK
438 if (!has_common) {
439 if (candidate.is_bare != -1) {
440 is_bare_repository_cfg = candidate.is_bare;
441 if (is_bare_repository_cfg == 1)
442 inside_work_tree = -1;
443 }
444 if (candidate.work_tree) {
445 free(git_work_tree_cfg);
446 git_work_tree_cfg = candidate.work_tree;
2cc7c2c7 447 inside_work_tree = -1;
652f18ee
JK
448 }
449 } else {
450 free(candidate.work_tree);
2cc7c2c7
JK
451 }
452
453 return 0;
454}
455
652f18ee 456int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
457{
458 memset(format, 0, sizeof(*format));
459 format->version = -1;
460 format->is_bare = -1;
461 string_list_init(&format->unknown_extensions, 1);
652f18ee 462 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
463 return format->version;
464}
465
2cc7c2c7
JK
466int verify_repository_format(const struct repository_format *format,
467 struct strbuf *err)
468{
469 if (GIT_REPO_VERSION_READ < format->version) {
274db840 470 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
471 GIT_REPO_VERSION_READ, format->version);
472 return -1;
473 }
474
475 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
476 int i;
477
274db840 478 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 479
2cc7c2c7
JK
480 for (i = 0; i < format->unknown_extensions.nr; i++)
481 strbuf_addf(err, "\n\t%s",
482 format->unknown_extensions.items[i].string);
483 return -1;
00a09d57
JK
484 }
485
2cc7c2c7 486 return 0;
9459aa77
NTND
487}
488
5f29433f
SB
489void read_gitfile_error_die(int error_code, const char *path, const char *dir)
490{
491 switch (error_code) {
492 case READ_GITFILE_ERR_STAT_FAILED:
493 case READ_GITFILE_ERR_NOT_A_FILE:
494 /* non-fatal; follow return path */
495 break;
496 case READ_GITFILE_ERR_OPEN_FAILED:
497 die_errno("Error opening '%s'", path);
498 case READ_GITFILE_ERR_TOO_LARGE:
499 die("Too large to be a .git file: '%s'", path);
500 case READ_GITFILE_ERR_READ_FAILED:
501 die("Error reading %s", path);
502 case READ_GITFILE_ERR_INVALID_FORMAT:
503 die("Invalid gitfile format: %s", path);
504 case READ_GITFILE_ERR_NO_PATH:
505 die("No path in gitfile: %s", path);
506 case READ_GITFILE_ERR_NOT_A_REPO:
507 die("Not a git repository: %s", dir);
508 default:
509 die("BUG: unknown error code");
510 }
511}
512
b44ebb19
LH
513/*
514 * Try to read the location of the git directory from the .git file,
515 * return path to git directory if found.
a93bedad
EE
516 *
517 * On failure, if return_error_code is not NULL, return_error_code
518 * will be set to an error code and NULL will be returned. If
519 * return_error_code is NULL the function will die instead (for most
520 * cases).
b44ebb19 521 */
a93bedad 522const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 523{
921bdd96 524 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
525 int error_code = 0;
526 char *buf = NULL;
527 char *dir = NULL;
40c813e0 528 const char *slash;
b44ebb19
LH
529 struct stat st;
530 int fd;
b1905aea 531 ssize_t len;
b44ebb19 532
a93bedad
EE
533 if (stat(path, &st)) {
534 error_code = READ_GITFILE_ERR_STAT_FAILED;
535 goto cleanup_return;
536 }
537 if (!S_ISREG(st.st_mode)) {
538 error_code = READ_GITFILE_ERR_NOT_A_FILE;
539 goto cleanup_return;
540 }
921bdd96
EE
541 if (st.st_size > max_file_size) {
542 error_code = READ_GITFILE_ERR_TOO_LARGE;
543 goto cleanup_return;
544 }
b44ebb19 545 fd = open(path, O_RDONLY);
a93bedad
EE
546 if (fd < 0) {
547 error_code = READ_GITFILE_ERR_OPEN_FAILED;
548 goto cleanup_return;
549 }
3733e694 550 buf = xmallocz(st.st_size);
b44ebb19
LH
551 len = read_in_full(fd, buf, st.st_size);
552 close(fd);
a93bedad
EE
553 if (len != st.st_size) {
554 error_code = READ_GITFILE_ERR_READ_FAILED;
555 goto cleanup_return;
556 }
a93bedad
EE
557 if (!starts_with(buf, "gitdir: ")) {
558 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
559 goto cleanup_return;
560 }
b44ebb19
LH
561 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
562 len--;
a93bedad
EE
563 if (len < 9) {
564 error_code = READ_GITFILE_ERR_NO_PATH;
565 goto cleanup_return;
566 }
b44ebb19 567 buf[len] = '\0';
40c813e0
BK
568 dir = buf + 8;
569
570 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
571 size_t pathlen = slash+1 - path;
75faa45a
JK
572 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
573 (int)(len - 8), buf + 8);
40c813e0
BK
574 free(buf);
575 buf = dir;
576 }
a93bedad
EE
577 if (!is_git_directory(dir)) {
578 error_code = READ_GITFILE_ERR_NOT_A_REPO;
579 goto cleanup_return;
580 }
e2a57aac 581 path = real_path(dir);
40c813e0 582
a93bedad 583cleanup_return:
a93bedad
EE
584 if (return_error_code)
585 *return_error_code = error_code;
5f29433f
SB
586 else if (error_code)
587 read_gitfile_error_die(error_code, path, dir);
a93bedad 588
b44ebb19 589 free(buf);
38ae8784 590 return error_code ? NULL : path;
b44ebb19
LH
591}
592
e4e30347 593static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 594 struct strbuf *cwd,
b3f66fd3 595 int *nongit_ok)
e4e30347 596{
b3f66fd3
NTND
597 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
598 const char *worktree;
599 char *gitfile;
9b125da4 600 int offset;
e4e30347
JN
601
602 if (PATH_MAX - 40 < strlen(gitdirenv))
603 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 604
13d6ec91 605 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
606 if (gitfile) {
607 gitfile = xstrdup(gitfile);
608 gitdirenv = gitfile;
609 }
610
e4e30347
JN
611 if (!is_git_directory(gitdirenv)) {
612 if (nongit_ok) {
613 *nongit_ok = 1;
b3f66fd3 614 free(gitfile);
e4e30347
JN
615 return NULL;
616 }
617 die("Not a git repository: '%s'", gitdirenv);
618 }
b3f66fd3
NTND
619
620 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
621 free(gitfile);
622 return NULL;
e4e30347 623 }
b3f66fd3
NTND
624
625 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
626 if (work_tree_env)
627 set_git_work_tree(work_tree_env);
628 else if (is_bare_repository_cfg > 0) {
fada7674
JK
629 if (git_work_tree_cfg) {
630 /* #22.2, #30 */
631 warning("core.bare and core.worktree do not make sense");
632 work_tree_config_is_bogus = 1;
633 }
b3f66fd3
NTND
634
635 /* #18, #26 */
636 set_git_dir(gitdirenv);
637 free(gitfile);
e4e30347 638 return NULL;
b3f66fd3
NTND
639 }
640 else if (git_work_tree_cfg) { /* #6, #14 */
641 if (is_absolute_path(git_work_tree_cfg))
642 set_git_work_tree(git_work_tree_cfg);
643 else {
56b9f6e7 644 char *core_worktree;
b3f66fd3
NTND
645 if (chdir(gitdirenv))
646 die_errno("Could not chdir to '%s'", gitdirenv);
647 if (chdir(git_work_tree_cfg))
648 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 649 core_worktree = xgetcwd();
7333ed17 650 if (chdir(cwd->buf))
b3f66fd3
NTND
651 die_errno("Could not come back to cwd");
652 set_git_work_tree(core_worktree);
56b9f6e7 653 free(core_worktree);
b3f66fd3
NTND
654 }
655 }
2cd83d10
JK
656 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
657 /* #16d */
658 set_git_dir(gitdirenv);
659 free(gitfile);
660 return NULL;
661 }
b3f66fd3
NTND
662 else /* #2, #10 */
663 set_git_work_tree(".");
664
665 /* set_git_work_tree() must have been called by now */
666 worktree = get_git_work_tree();
667
668 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 669 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
670 set_git_dir(gitdirenv);
671 free(gitfile);
e4e30347 672 return NULL;
b3f66fd3 673 }
e4e30347 674
7333ed17 675 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 676 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 677 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
678 if (chdir(worktree))
679 die_errno("Could not chdir to '%s'", worktree);
7333ed17 680 strbuf_addch(cwd, '/');
b3f66fd3 681 free(gitfile);
7333ed17 682 return cwd->buf + offset;
93a00542 683 }
b3f66fd3
NTND
684
685 /* cwd outside worktree */
686 set_git_dir(gitdirenv);
687 free(gitfile);
688 return NULL;
93a00542
JN
689}
690
9951d3b3 691static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 692 struct strbuf *cwd, int offset,
9951d3b3 693 int *nongit_ok)
98937bef 694{
9951d3b3
NTND
695 if (check_repository_format_gently(gitdir, nongit_ok))
696 return NULL;
98937bef 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) {
7333ed17 700 if (offset != cwd->len && !is_absolute_path(gitdir))
4ac9006f 701 gitdir = real_pathdup(gitdir);
7333ed17 702 if (chdir(cwd->buf))
4868b2ea 703 die_errno("Could not come back to cwd");
7333ed17 704 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
705 }
706
9951d3b3
NTND
707 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
708 if (is_bare_repository_cfg > 0) {
7333ed17
RS
709 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
710 if (chdir(cwd->buf))
9951d3b3 711 die_errno("Could not come back to cwd");
98937bef 712 return NULL;
9951d3b3 713 }
98937bef 714
9951d3b3
NTND
715 /* #0, #1, #5, #8, #9, #12, #13 */
716 set_git_work_tree(".");
717 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
718 set_git_dir(gitdir);
98937bef 719 inside_git_dir = 0;
9951d3b3 720 inside_work_tree = 1;
7333ed17 721 if (offset == cwd->len)
98937bef
NTND
722 return NULL;
723
df380d58
JS
724 /* Make "offset" point past the '/' (already the case for root dirs) */
725 if (offset != offset_1st_component(cwd->buf))
726 offset++;
727 /* Add a '/' at the end */
7333ed17
RS
728 strbuf_addch(cwd, '/');
729 return cwd->buf + offset;
98937bef
NTND
730}
731
1cd8031b 732/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
733static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
734 int *nongit_ok)
68698da5
JN
735{
736 int root_len;
737
1cd8031b
NTND
738 if (check_repository_format_gently(".", nongit_ok))
739 return NULL;
740
2cd83d10
JK
741 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
742
4868b2ea
JN
743 /* --work-tree is set without --git-dir; use discovered one */
744 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
745 const char *gitdir;
746
7333ed17
RS
747 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
748 if (chdir(cwd->buf))
4868b2ea 749 die_errno("Could not come back to cwd");
7333ed17 750 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
751 }
752
68698da5 753 inside_git_dir = 1;
1cd8031b 754 inside_work_tree = 0;
7333ed17
RS
755 if (offset != cwd->len) {
756 if (chdir(cwd->buf))
8fc0ae80 757 die_errno("Cannot come back to cwd");
7333ed17
RS
758 root_len = offset_1st_component(cwd->buf);
759 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
760 set_git_dir(cwd->buf);
337e51ce 761 }
1cd8031b 762 else
68698da5 763 set_git_dir(".");
68698da5
JN
764 return NULL;
765}
766
f161edeb
JN
767static const char *setup_nongit(const char *cwd, int *nongit_ok)
768{
769 if (!nongit_ok)
2ff30e67 770 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 771 if (chdir(cwd))
2ff30e67 772 die_errno(_("Cannot come back to cwd"));
f161edeb
JN
773 *nongit_ok = 1;
774 return NULL;
775}
776
2565b43b 777static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
778{
779 struct stat buf;
2565b43b
CB
780 if (stat(path, &buf)) {
781 die_errno("failed to stat '%*s%s%s'",
782 prefix_len,
60c98d1e
JN
783 prefix ? prefix : "",
784 prefix ? "/" : "", path);
2565b43b 785 }
60c98d1e
JN
786 return buf.st_dev;
787}
788
9e2326c7 789/*
1b77d83c
MH
790 * A "string_list_each_func_t" function that canonicalizes an entry
791 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
792 * discards it if unusable. The presence of an empty entry in
793 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
794 * subsequent entries.
9e2326c7 795 */
1b77d83c 796static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 797 void *cb_data)
9e2326c7 798{
7ec30aaa 799 int *empty_entry_found = cb_data;
1b77d83c 800 char *ceil = item->string;
9e2326c7 801
7ec30aaa
MH
802 if (!*ceil) {
803 *empty_entry_found = 1;
9e2326c7 804 return 0;
7ec30aaa 805 } else if (!is_absolute_path(ceil)) {
9e2326c7 806 return 0;
7ec30aaa
MH
807 } else if (*empty_entry_found) {
808 /* Keep entry but do not canonicalize it */
809 return 1;
810 } else {
4ac9006f
BW
811 char *real_path = real_pathdup(ceil);
812 if (!real_path) {
7ec30aaa 813 return 0;
4ac9006f 814 }
7ec30aaa 815 free(item->string);
4ac9006f 816 item->string = real_path;
7ec30aaa
MH
817 return 1;
818 }
9e2326c7
MH
819}
820
e90fdc39
JS
821/*
822 * We cannot decide in this function whether we are in the work tree or
823 * not, since the config can only be read _after_ this function was called.
824 */
a60645f9 825static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 826{
0454dd93 827 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 828 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
7333ed17 829 static struct strbuf cwd = STRBUF_INIT;
9951d3b3
NTND
830 const char *gitdirenv, *ret;
831 char *gitfile;
7333ed17 832 int offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
833 dev_t current_device = 0;
834 int one_filesystem = 1;
d288a700 835
3c8687a7
TA
836 /*
837 * We may have read an incomplete configuration before
838 * setting-up the git directory. If so, clear the cache so
839 * that the next queries to the configuration reload complete
840 * configuration (including the per-repo config file that we
841 * ignored previously).
842 */
843 git_config_clear();
844
af05d679
SG
845 /*
846 * Let's assume that we are in a git repository.
847 * If it turns out later that we are somewhere else, the value will be
848 * updated accordingly.
849 */
850 if (nongit_ok)
851 *nongit_ok = 0;
852
7333ed17 853 if (strbuf_getcwd(&cwd))
2ff30e67 854 die_errno(_("Unable to read current working directory"));
7333ed17 855 offset = cwd.len;
b3f66fd3 856
e90fdc39
JS
857 /*
858 * If GIT_DIR is set explicitly, we're not going
859 * to do any discovery, but we still do repository
860 * validation.
861 */
ad1a382f 862 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 863 if (gitdirenv)
7333ed17 864 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
d288a700 865
31171d9e 866 if (env_ceiling_dirs) {
7ec30aaa
MH
867 int empty_entry_found = 0;
868
31171d9e 869 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 870 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 871 canonicalize_ceiling_entry, &empty_entry_found);
7333ed17 872 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
31171d9e
MH
873 string_list_clear(&ceiling_dirs, 0);
874 }
875
7333ed17 876 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
17d778e7 877 ceil_offset = 1;
d288a700 878
892c41b9 879 /*
e90fdc39 880 * Test in the following order (relative to the cwd):
b44ebb19 881 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
882 * - .git/
883 * - ./ (bare)
b44ebb19 884 * - ../.git
e90fdc39
JS
885 * - ../.git/
886 * - ../ (bare)
887 * - ../../.git/
888 * etc.
892c41b9 889 */
cf87463e 890 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 891 if (one_filesystem)
2565b43b 892 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 893 for (;;) {
13d6ec91 894 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
895 if (gitfile)
896 gitdirenv = gitfile = xstrdup(gitfile);
897 else {
898 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
899 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
900 }
901
902 if (gitdirenv) {
903 ret = setup_discovered_git_dir(gitdirenv,
7333ed17 904 &cwd, offset,
9951d3b3
NTND
905 nongit_ok);
906 free(gitfile);
907 return ret;
908 }
909 free(gitfile);
910
68698da5 911 if (is_git_directory("."))
7333ed17 912 return setup_bare_git_dir(&cwd, offset, nongit_ok);
1cd8031b 913
2565b43b 914 offset_parent = offset;
6c1e6544
JS
915 while (--offset_parent > ceil_offset &&
916 !is_dir_sep(cwd.buf[offset_parent]))
917 ; /* continue */
2565b43b 918 if (offset_parent <= ceil_offset)
7333ed17 919 return setup_nongit(cwd.buf, nongit_ok);
8030e442 920 if (one_filesystem) {
7333ed17
RS
921 dev_t parent_device = get_device_or_die("..", cwd.buf,
922 offset);
60c98d1e 923 if (parent_device != current_device) {
8030e442 924 if (nongit_ok) {
7333ed17 925 if (chdir(cwd.buf))
2ff30e67 926 die_errno(_("Cannot come back to cwd"));
8030e442
LD
927 *nongit_ok = 1;
928 return NULL;
929 }
7333ed17 930 strbuf_setlen(&cwd, offset);
2ff30e67
VA
931 die(_("Not a git repository (or any parent up to mount point %s)\n"
932 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
7333ed17 933 cwd.buf);
8030e442
LD
934 }
935 }
502ffe34 936 if (chdir("..")) {
7333ed17 937 strbuf_setlen(&cwd, offset);
2ff30e67 938 die_errno(_("Cannot change to '%s/..'"), cwd.buf);
502ffe34 939 }
2565b43b 940 offset = offset_parent;
892c41b9 941 }
d288a700 942}
5e7bfe25 943
a60645f9
NTND
944const char *setup_git_directory_gently(int *nongit_ok)
945{
946 const char *prefix;
947
948 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 949 if (prefix)
a6f7f9a3 950 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 951 else
a6f7f9a3 952 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 953
46c3cd44
JK
954 startup_info->have_repository = !nongit_ok || !*nongit_ok;
955 startup_info->prefix = prefix;
956
a60645f9
NTND
957 return prefix;
958}
959
94df2506
JH
960int git_config_perm(const char *var, const char *value)
961{
06cbe855
HO
962 int i;
963 char *endptr;
964
965 if (value == NULL)
966 return PERM_GROUP;
967
968 if (!strcmp(value, "umask"))
969 return PERM_UMASK;
970 if (!strcmp(value, "group"))
971 return PERM_GROUP;
972 if (!strcmp(value, "all") ||
973 !strcmp(value, "world") ||
974 !strcmp(value, "everybody"))
975 return PERM_EVERYBODY;
976
977 /* Parse octal numbers */
978 i = strtol(value, &endptr, 8);
979
980 /* If not an octal number, maybe true/false? */
981 if (*endptr != 0)
982 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
983
984 /*
985 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 986 * a chmod value to restrict to.
06cbe855
HO
987 */
988 switch (i) {
989 case PERM_UMASK: /* 0 */
990 return PERM_UMASK;
991 case OLD_PERM_GROUP: /* 1 */
992 return PERM_GROUP;
993 case OLD_PERM_EVERYBODY: /* 2 */
994 return PERM_EVERYBODY;
94df2506 995 }
06cbe855
HO
996
997 /* A filemode value was given: 0xxx */
998
999 if ((i & 0600) != 0600)
2ff30e67 1000 die(_("Problem with core.sharedRepository filemode value "
06cbe855 1001 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1002 "read and write permissions."), i);
06cbe855
HO
1003
1004 /*
1005 * Mask filemode value. Others can not get write permission.
1006 * x flags for directories are handled separately.
1007 */
5a688fe4 1008 return -(i & 0666);
94df2506
JH
1009}
1010
4b0d1eeb 1011void check_repository_format(void)
ab9cb76f 1012{
f1c126bd
JK
1013 check_repository_format_gently(get_git_dir(), NULL);
1014 startup_info->have_repository = 1;
ab9cb76f
JH
1015}
1016
e1e5ec86
CB
1017/*
1018 * Returns the "prefix", a path to the current working directory
1019 * relative to the work tree root, or NULL, if the current working
1020 * directory is not a strict subdirectory of the work tree root. The
1021 * prefix always ends with a '/' character.
1022 */
5e7bfe25
JH
1023const char *setup_git_directory(void)
1024{
b3f66fd3 1025 return setup_git_directory_gently(NULL);
5e7bfe25 1026}
abc06822 1027
40d96325 1028const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1029{
1030 if (is_git_directory(suspect))
1031 return suspect;
40d96325 1032 return read_gitfile_gently(suspect, return_error_code);
abc06822 1033}
1d999ddd
TR
1034
1035/* if any standard file descriptor is missing open it to /dev/null */
1036void sanitize_stdfds(void)
1037{
1038 int fd = open("/dev/null", O_RDWR, 0);
1039 while (fd != -1 && fd < 2)
1040 fd = dup(fd);
1041 if (fd == -1)
1042 die_errno("open /dev/null or dup failed");
1043 if (fd > 2)
1044 close(fd);
1045}
de0957ce
NTND
1046
1047int daemonize(void)
1048{
1049#ifdef NO_POSIX_GOODIES
1050 errno = ENOSYS;
1051 return -1;
1052#else
1053 switch (fork()) {
1054 case 0:
1055 break;
1056 case -1:
1057 die_errno("fork failed");
1058 default:
1059 exit(0);
1060 }
1061 if (setsid() == -1)
1062 die_errno("setsid failed");
1063 close(0);
1064 close(1);
1065 close(2);
1066 sanitize_stdfds();
1067 return 0;
1068#endif
1069}