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