prefix_filename: drop length parameter
[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)
116fb64e 145 name = prefix_filename(prefix, arg);
4db86e8b
NTND
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);
33ad9ddd 257 strbuf_add_real_path(sb, 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 533 if (stat(path, &st)) {
5c4003ca 534 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
535 error_code = READ_GITFILE_ERR_STAT_FAILED;
536 goto cleanup_return;
537 }
538 if (!S_ISREG(st.st_mode)) {
539 error_code = READ_GITFILE_ERR_NOT_A_FILE;
540 goto cleanup_return;
541 }
921bdd96
EE
542 if (st.st_size > max_file_size) {
543 error_code = READ_GITFILE_ERR_TOO_LARGE;
544 goto cleanup_return;
545 }
b44ebb19 546 fd = open(path, O_RDONLY);
a93bedad
EE
547 if (fd < 0) {
548 error_code = READ_GITFILE_ERR_OPEN_FAILED;
549 goto cleanup_return;
550 }
3733e694 551 buf = xmallocz(st.st_size);
b44ebb19
LH
552 len = read_in_full(fd, buf, st.st_size);
553 close(fd);
a93bedad
EE
554 if (len != st.st_size) {
555 error_code = READ_GITFILE_ERR_READ_FAILED;
556 goto cleanup_return;
557 }
a93bedad
EE
558 if (!starts_with(buf, "gitdir: ")) {
559 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
560 goto cleanup_return;
561 }
b44ebb19
LH
562 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
563 len--;
a93bedad
EE
564 if (len < 9) {
565 error_code = READ_GITFILE_ERR_NO_PATH;
566 goto cleanup_return;
567 }
b44ebb19 568 buf[len] = '\0';
40c813e0
BK
569 dir = buf + 8;
570
571 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
572 size_t pathlen = slash+1 - path;
75faa45a
JK
573 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
574 (int)(len - 8), buf + 8);
40c813e0
BK
575 free(buf);
576 buf = dir;
577 }
a93bedad
EE
578 if (!is_git_directory(dir)) {
579 error_code = READ_GITFILE_ERR_NOT_A_REPO;
580 goto cleanup_return;
581 }
e2a57aac 582 path = real_path(dir);
40c813e0 583
a93bedad 584cleanup_return:
a93bedad
EE
585 if (return_error_code)
586 *return_error_code = error_code;
5f29433f
SB
587 else if (error_code)
588 read_gitfile_error_die(error_code, path, dir);
a93bedad 589
b44ebb19 590 free(buf);
38ae8784 591 return error_code ? NULL : path;
b44ebb19
LH
592}
593
e4e30347 594static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 595 struct strbuf *cwd,
b3f66fd3 596 int *nongit_ok)
e4e30347 597{
b3f66fd3
NTND
598 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
599 const char *worktree;
600 char *gitfile;
9b125da4 601 int offset;
e4e30347
JN
602
603 if (PATH_MAX - 40 < strlen(gitdirenv))
604 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 605
13d6ec91 606 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
607 if (gitfile) {
608 gitfile = xstrdup(gitfile);
609 gitdirenv = gitfile;
610 }
611
e4e30347
JN
612 if (!is_git_directory(gitdirenv)) {
613 if (nongit_ok) {
614 *nongit_ok = 1;
b3f66fd3 615 free(gitfile);
e4e30347
JN
616 return NULL;
617 }
618 die("Not a git repository: '%s'", gitdirenv);
619 }
b3f66fd3
NTND
620
621 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
622 free(gitfile);
623 return NULL;
e4e30347 624 }
b3f66fd3
NTND
625
626 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
627 if (work_tree_env)
628 set_git_work_tree(work_tree_env);
629 else if (is_bare_repository_cfg > 0) {
fada7674
JK
630 if (git_work_tree_cfg) {
631 /* #22.2, #30 */
632 warning("core.bare and core.worktree do not make sense");
633 work_tree_config_is_bogus = 1;
634 }
b3f66fd3
NTND
635
636 /* #18, #26 */
637 set_git_dir(gitdirenv);
638 free(gitfile);
e4e30347 639 return NULL;
b3f66fd3
NTND
640 }
641 else if (git_work_tree_cfg) { /* #6, #14 */
642 if (is_absolute_path(git_work_tree_cfg))
643 set_git_work_tree(git_work_tree_cfg);
644 else {
56b9f6e7 645 char *core_worktree;
b3f66fd3
NTND
646 if (chdir(gitdirenv))
647 die_errno("Could not chdir to '%s'", gitdirenv);
648 if (chdir(git_work_tree_cfg))
649 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 650 core_worktree = xgetcwd();
7333ed17 651 if (chdir(cwd->buf))
b3f66fd3
NTND
652 die_errno("Could not come back to cwd");
653 set_git_work_tree(core_worktree);
56b9f6e7 654 free(core_worktree);
b3f66fd3
NTND
655 }
656 }
2cd83d10
JK
657 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
658 /* #16d */
659 set_git_dir(gitdirenv);
660 free(gitfile);
661 return NULL;
662 }
b3f66fd3
NTND
663 else /* #2, #10 */
664 set_git_work_tree(".");
665
666 /* set_git_work_tree() must have been called by now */
667 worktree = get_git_work_tree();
668
669 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 670 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
671 set_git_dir(gitdirenv);
672 free(gitfile);
e4e30347 673 return NULL;
b3f66fd3 674 }
e4e30347 675
7333ed17 676 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 677 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 678 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
679 if (chdir(worktree))
680 die_errno("Could not chdir to '%s'", worktree);
7333ed17 681 strbuf_addch(cwd, '/');
b3f66fd3 682 free(gitfile);
7333ed17 683 return cwd->buf + offset;
93a00542 684 }
b3f66fd3
NTND
685
686 /* cwd outside worktree */
687 set_git_dir(gitdirenv);
688 free(gitfile);
689 return NULL;
93a00542
JN
690}
691
9951d3b3 692static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 693 struct strbuf *cwd, int offset,
9951d3b3 694 int *nongit_ok)
98937bef 695{
9951d3b3
NTND
696 if (check_repository_format_gently(gitdir, nongit_ok))
697 return NULL;
98937bef 698
4868b2ea
JN
699 /* --work-tree is set without --git-dir; use discovered one */
700 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 701 if (offset != cwd->len && !is_absolute_path(gitdir))
ce83eadd 702 gitdir = real_pathdup(gitdir, 1);
7333ed17 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
9951d3b3
NTND
708 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
709 if (is_bare_repository_cfg > 0) {
7333ed17
RS
710 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
711 if (chdir(cwd->buf))
9951d3b3 712 die_errno("Could not come back to cwd");
98937bef 713 return NULL;
9951d3b3 714 }
98937bef 715
9951d3b3
NTND
716 /* #0, #1, #5, #8, #9, #12, #13 */
717 set_git_work_tree(".");
718 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
719 set_git_dir(gitdir);
98937bef 720 inside_git_dir = 0;
9951d3b3 721 inside_work_tree = 1;
7333ed17 722 if (offset == cwd->len)
98937bef
NTND
723 return NULL;
724
df380d58
JS
725 /* Make "offset" point past the '/' (already the case for root dirs) */
726 if (offset != offset_1st_component(cwd->buf))
727 offset++;
728 /* Add a '/' at the end */
7333ed17
RS
729 strbuf_addch(cwd, '/');
730 return cwd->buf + offset;
98937bef
NTND
731}
732
1cd8031b 733/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
734static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
735 int *nongit_ok)
68698da5
JN
736{
737 int root_len;
738
1cd8031b
NTND
739 if (check_repository_format_gently(".", nongit_ok))
740 return NULL;
741
2cd83d10
JK
742 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
743
4868b2ea
JN
744 /* --work-tree is set without --git-dir; use discovered one */
745 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
746 const char *gitdir;
747
7333ed17
RS
748 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
749 if (chdir(cwd->buf))
4868b2ea 750 die_errno("Could not come back to cwd");
7333ed17 751 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
752 }
753
68698da5 754 inside_git_dir = 1;
1cd8031b 755 inside_work_tree = 0;
7333ed17
RS
756 if (offset != cwd->len) {
757 if (chdir(cwd->buf))
8fc0ae80 758 die_errno("Cannot come back to cwd");
7333ed17
RS
759 root_len = offset_1st_component(cwd->buf);
760 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
761 set_git_dir(cwd->buf);
337e51ce 762 }
1cd8031b 763 else
68698da5 764 set_git_dir(".");
68698da5
JN
765 return NULL;
766}
767
f161edeb
JN
768static const char *setup_nongit(const char *cwd, int *nongit_ok)
769{
770 if (!nongit_ok)
2ff30e67 771 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 772 if (chdir(cwd))
2ff30e67 773 die_errno(_("Cannot come back to cwd"));
f161edeb
JN
774 *nongit_ok = 1;
775 return NULL;
776}
777
2565b43b 778static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
779{
780 struct stat buf;
2565b43b
CB
781 if (stat(path, &buf)) {
782 die_errno("failed to stat '%*s%s%s'",
783 prefix_len,
60c98d1e
JN
784 prefix ? prefix : "",
785 prefix ? "/" : "", path);
2565b43b 786 }
60c98d1e
JN
787 return buf.st_dev;
788}
789
9e2326c7 790/*
1b77d83c
MH
791 * A "string_list_each_func_t" function that canonicalizes an entry
792 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
793 * discards it if unusable. The presence of an empty entry in
794 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
795 * subsequent entries.
9e2326c7 796 */
1b77d83c 797static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 798 void *cb_data)
9e2326c7 799{
7ec30aaa 800 int *empty_entry_found = cb_data;
1b77d83c 801 char *ceil = item->string;
9e2326c7 802
7ec30aaa
MH
803 if (!*ceil) {
804 *empty_entry_found = 1;
9e2326c7 805 return 0;
7ec30aaa 806 } else if (!is_absolute_path(ceil)) {
9e2326c7 807 return 0;
7ec30aaa
MH
808 } else if (*empty_entry_found) {
809 /* Keep entry but do not canonicalize it */
810 return 1;
811 } else {
ce83eadd 812 char *real_path = real_pathdup(ceil, 0);
4ac9006f 813 if (!real_path) {
7ec30aaa 814 return 0;
4ac9006f 815 }
7ec30aaa 816 free(item->string);
4ac9006f 817 item->string = real_path;
7ec30aaa
MH
818 return 1;
819 }
9e2326c7
MH
820}
821
ce9b8aab
JS
822enum discovery_result {
823 GIT_DIR_NONE = 0,
824 GIT_DIR_EXPLICIT,
825 GIT_DIR_DISCOVERED,
826 GIT_DIR_BARE,
827 /* these are errors */
828 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
829 GIT_DIR_HIT_MOUNT_POINT = -2,
830 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
831};
832
e90fdc39
JS
833/*
834 * We cannot decide in this function whether we are in the work tree or
835 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
836 *
837 * Also, we avoid changing any global state (such as the current working
838 * directory) to allow early callers.
839 *
840 * The directory where the search should start needs to be passed in via the
841 * `dir` parameter; upon return, the `dir` buffer will contain the path of
842 * the directory where the search ended, and `gitdir` will contain the path of
843 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
844 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 845 */
ce9b8aab 846static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
847 struct strbuf *gitdir,
848 int die_on_error)
d288a700 849{
0454dd93 850 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 851 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
852 const char *gitdirenv;
853 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
854 dev_t current_device = 0;
855 int one_filesystem = 1;
d288a700 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);
ce9b8aab
JS
863 if (gitdirenv) {
864 strbuf_addstr(gitdir, gitdirenv);
865 return GIT_DIR_EXPLICIT;
866 }
d288a700 867
31171d9e 868 if (env_ceiling_dirs) {
7ec30aaa
MH
869 int empty_entry_found = 0;
870
31171d9e 871 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 872 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 873 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 874 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
875 string_list_clear(&ceiling_dirs, 0);
876 }
877
ce9b8aab
JS
878 if (ceil_offset < 0)
879 ceil_offset = min_offset - 2;
d288a700 880
892c41b9 881 /*
ce9b8aab 882 * Test in the following order (relative to the dir):
b44ebb19 883 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
884 * - .git/
885 * - ./ (bare)
b44ebb19 886 * - ../.git
e90fdc39
JS
887 * - ../.git/
888 * - ../ (bare)
889 * - ../../.git/
890 * etc.
892c41b9 891 */
cf87463e 892 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 893 if (one_filesystem)
ce9b8aab 894 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 895 for (;;) {
01017dce 896 int offset = dir->len, error_code = 0;
ce9b8aab
JS
897
898 if (offset > min_offset)
899 strbuf_addch(dir, '/');
900 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
901 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
902 NULL : &error_code);
903 if (!gitdirenv) {
904 if (die_on_error ||
905 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 906 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
907 if (is_git_directory(dir->buf))
908 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
909 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
910 return GIT_DIR_INVALID_GITFILE;
9951d3b3 911 }
ce9b8aab 912 strbuf_setlen(dir, offset);
9951d3b3 913 if (gitdirenv) {
ce9b8aab
JS
914 strbuf_addstr(gitdir, gitdirenv);
915 return GIT_DIR_DISCOVERED;
9951d3b3 916 }
9951d3b3 917
ce9b8aab
JS
918 if (is_git_directory(dir->buf)) {
919 strbuf_addstr(gitdir, ".");
920 return GIT_DIR_BARE;
502ffe34 921 }
9951d3b3 922
ce9b8aab
JS
923 if (offset <= min_offset)
924 return GIT_DIR_HIT_CEILING;
1cd8031b 925
ce9b8aab 926 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 927 ; /* continue */
ce9b8aab
JS
928 if (offset <= ceil_offset)
929 return GIT_DIR_HIT_CEILING;
930
931 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
932 if (one_filesystem &&
933 current_device != get_device_or_die(dir->buf, NULL, offset))
934 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 935 }
d288a700 936}
5e7bfe25 937
16ac8b8d
JS
938const char *discover_git_directory(struct strbuf *gitdir)
939{
940 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
941 size_t gitdir_offset = gitdir->len, cwd_len;
942 struct repository_format candidate;
943
944 if (strbuf_getcwd(&dir))
945 return NULL;
946
947 cwd_len = dir.len;
01017dce 948 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d
JS
949 strbuf_release(&dir);
950 return NULL;
951 }
952
953 /*
954 * The returned gitdir is relative to dir, and if dir does not reflect
955 * the current working directory, we simply make the gitdir absolute.
956 */
957 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
958 /* Avoid a trailing "/." */
959 if (!strcmp(".", gitdir->buf + gitdir_offset))
960 strbuf_setlen(gitdir, gitdir_offset);
961 else
962 strbuf_addch(&dir, '/');
963 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
964 }
965
966 strbuf_reset(&dir);
967 strbuf_addf(&dir, "%s/config", gitdir->buf + gitdir_offset);
968 read_repository_format(&candidate, dir.buf);
969 strbuf_release(&dir);
970
971 if (verify_repository_format(&candidate, &err) < 0) {
972 warning("ignoring git dir '%s': %s",
973 gitdir->buf + gitdir_offset, err.buf);
974 strbuf_release(&err);
975 return NULL;
976 }
977
978 return gitdir->buf + gitdir_offset;
979}
980
a60645f9
NTND
981const char *setup_git_directory_gently(int *nongit_ok)
982{
ce9b8aab
JS
983 static struct strbuf cwd = STRBUF_INIT;
984 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
a60645f9
NTND
985 const char *prefix;
986
ce9b8aab
JS
987 /*
988 * We may have read an incomplete configuration before
989 * setting-up the git directory. If so, clear the cache so
990 * that the next queries to the configuration reload complete
991 * configuration (including the per-repo config file that we
992 * ignored previously).
993 */
994 git_config_clear();
995
996 /*
997 * Let's assume that we are in a git repository.
998 * If it turns out later that we are somewhere else, the value will be
999 * updated accordingly.
1000 */
1001 if (nongit_ok)
1002 *nongit_ok = 0;
1003
1004 if (strbuf_getcwd(&cwd))
1005 die_errno(_("Unable to read current working directory"));
1006 strbuf_addbuf(&dir, &cwd);
1007
01017dce 1008 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1009 case GIT_DIR_NONE:
1010 prefix = NULL;
1011 break;
1012 case GIT_DIR_EXPLICIT:
1013 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1014 break;
1015 case GIT_DIR_DISCOVERED:
1016 if (dir.len < cwd.len && chdir(dir.buf))
1017 die(_("Cannot change to '%s'"), dir.buf);
1018 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1019 nongit_ok);
1020 break;
1021 case GIT_DIR_BARE:
1022 if (dir.len < cwd.len && chdir(dir.buf))
1023 die(_("Cannot change to '%s'"), dir.buf);
1024 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1025 break;
1026 case GIT_DIR_HIT_CEILING:
1027 prefix = setup_nongit(cwd.buf, nongit_ok);
1028 break;
1029 case GIT_DIR_HIT_MOUNT_POINT:
1030 if (nongit_ok) {
1031 *nongit_ok = 1;
1032 strbuf_release(&cwd);
1033 strbuf_release(&dir);
1034 return NULL;
1035 }
1036 die(_("Not a git repository (or any parent up to mount point %s)\n"
1037 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1038 dir.buf);
1039 default:
1040 die("BUG: unhandled setup_git_directory_1() result");
1041 }
1042
1f5d271f 1043 if (prefix)
a6f7f9a3 1044 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 1045 else
a6f7f9a3 1046 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 1047
46c3cd44
JK
1048 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1049 startup_info->prefix = prefix;
1050
ce9b8aab
JS
1051 strbuf_release(&dir);
1052 strbuf_release(&gitdir);
1053
a60645f9
NTND
1054 return prefix;
1055}
1056
94df2506
JH
1057int git_config_perm(const char *var, const char *value)
1058{
06cbe855
HO
1059 int i;
1060 char *endptr;
1061
1062 if (value == NULL)
1063 return PERM_GROUP;
1064
1065 if (!strcmp(value, "umask"))
1066 return PERM_UMASK;
1067 if (!strcmp(value, "group"))
1068 return PERM_GROUP;
1069 if (!strcmp(value, "all") ||
1070 !strcmp(value, "world") ||
1071 !strcmp(value, "everybody"))
1072 return PERM_EVERYBODY;
1073
1074 /* Parse octal numbers */
1075 i = strtol(value, &endptr, 8);
1076
1077 /* If not an octal number, maybe true/false? */
1078 if (*endptr != 0)
1079 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1080
1081 /*
1082 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1083 * a chmod value to restrict to.
06cbe855
HO
1084 */
1085 switch (i) {
1086 case PERM_UMASK: /* 0 */
1087 return PERM_UMASK;
1088 case OLD_PERM_GROUP: /* 1 */
1089 return PERM_GROUP;
1090 case OLD_PERM_EVERYBODY: /* 2 */
1091 return PERM_EVERYBODY;
94df2506 1092 }
06cbe855
HO
1093
1094 /* A filemode value was given: 0xxx */
1095
1096 if ((i & 0600) != 0600)
2ff30e67 1097 die(_("Problem with core.sharedRepository filemode value "
06cbe855 1098 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1099 "read and write permissions."), i);
06cbe855
HO
1100
1101 /*
1102 * Mask filemode value. Others can not get write permission.
1103 * x flags for directories are handled separately.
1104 */
5a688fe4 1105 return -(i & 0666);
94df2506
JH
1106}
1107
4b0d1eeb 1108void check_repository_format(void)
ab9cb76f 1109{
f1c126bd
JK
1110 check_repository_format_gently(get_git_dir(), NULL);
1111 startup_info->have_repository = 1;
ab9cb76f
JH
1112}
1113
e1e5ec86
CB
1114/*
1115 * Returns the "prefix", a path to the current working directory
1116 * relative to the work tree root, or NULL, if the current working
1117 * directory is not a strict subdirectory of the work tree root. The
1118 * prefix always ends with a '/' character.
1119 */
5e7bfe25
JH
1120const char *setup_git_directory(void)
1121{
b3f66fd3 1122 return setup_git_directory_gently(NULL);
5e7bfe25 1123}
abc06822 1124
40d96325 1125const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1126{
1127 if (is_git_directory(suspect))
1128 return suspect;
40d96325 1129 return read_gitfile_gently(suspect, return_error_code);
abc06822 1130}
1d999ddd
TR
1131
1132/* if any standard file descriptor is missing open it to /dev/null */
1133void sanitize_stdfds(void)
1134{
1135 int fd = open("/dev/null", O_RDWR, 0);
1136 while (fd != -1 && fd < 2)
1137 fd = dup(fd);
1138 if (fd == -1)
1139 die_errno("open /dev/null or dup failed");
1140 if (fd > 2)
1141 close(fd);
1142}
de0957ce
NTND
1143
1144int daemonize(void)
1145{
1146#ifdef NO_POSIX_GOODIES
1147 errno = ENOSYS;
1148 return -1;
1149#else
1150 switch (fork()) {
1151 case 0:
1152 break;
1153 case -1:
1154 die_errno("fork failed");
1155 default:
1156 exit(0);
1157 }
1158 if (setsid() == -1)
1159 die_errno("setsid failed");
1160 close(0);
1161 close(1);
1162 close(2);
1163 sanitize_stdfds();
1164 return 0;
1165#endif
1166}