Merge branch 'jx/clean-interactive'
[git/git.git] / setup.c
1 #include "cache.h"
2 #include "dir.h"
3 #include "string-list.h"
4
5 static int inside_git_dir = -1;
6 static int inside_work_tree = -1;
7
8 static char *prefix_path_gently(const char *prefix, int len, const char *path)
9 {
10 const char *orig = path;
11 char *sanitized;
12 if (is_absolute_path(orig)) {
13 const char *temp = real_path(path);
14 sanitized = xmalloc(len + strlen(temp) + 1);
15 strcpy(sanitized, temp);
16 } else {
17 sanitized = xmalloc(len + strlen(path) + 1);
18 if (len)
19 memcpy(sanitized, prefix, len);
20 strcpy(sanitized + len, path);
21 }
22 if (normalize_path_copy(sanitized, sanitized))
23 goto error_out;
24 if (is_absolute_path(orig)) {
25 size_t root_len, len, total;
26 const char *work_tree = get_git_work_tree();
27 if (!work_tree)
28 goto error_out;
29 len = strlen(work_tree);
30 root_len = offset_1st_component(work_tree);
31 total = strlen(sanitized) + 1;
32 if (strncmp(sanitized, work_tree, len) ||
33 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
34 error_out:
35 free(sanitized);
36 return NULL;
37 }
38 if (sanitized[len] == '/')
39 len++;
40 memmove(sanitized, sanitized + len, total - len);
41 }
42 return sanitized;
43 }
44
45 char *prefix_path(const char *prefix, int len, const char *path)
46 {
47 char *r = prefix_path_gently(prefix, len, path);
48 if (!r)
49 die("'%s' is outside repository", path);
50 return r;
51 }
52
53 int path_inside_repo(const char *prefix, const char *path)
54 {
55 int len = prefix ? strlen(prefix) : 0;
56 char *r = prefix_path_gently(prefix, len, path);
57 if (r) {
58 free(r);
59 return 1;
60 }
61 return 0;
62 }
63
64 int check_filename(const char *prefix, const char *arg)
65 {
66 const char *name;
67 struct stat st;
68
69 if (!prefixcmp(arg, ":/")) {
70 if (arg[2] == '\0') /* ":/" is root dir, always exists */
71 return 1;
72 name = arg + 2;
73 } else if (prefix)
74 name = prefix_filename(prefix, strlen(prefix), arg);
75 else
76 name = arg;
77 if (!lstat(name, &st))
78 return 1; /* file exists */
79 if (errno == ENOENT || errno == ENOTDIR)
80 return 0; /* file does not exist */
81 die_errno("failed to stat '%s'", arg);
82 }
83
84 static void NORETURN die_verify_filename(const char *prefix,
85 const char *arg,
86 int diagnose_misspelt_rev)
87 {
88 if (!diagnose_misspelt_rev)
89 die("%s: no such path in the working tree.\n"
90 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
91 arg);
92 /*
93 * Saying "'(icase)foo' does not exist in the index" when the
94 * user gave us ":(icase)foo" is just stupid. A magic pathspec
95 * begins with a colon and is followed by a non-alnum; do not
96 * let maybe_die_on_misspelt_object_name() even trigger.
97 */
98 if (!(arg[0] == ':' && !isalnum(arg[1])))
99 maybe_die_on_misspelt_object_name(arg, prefix);
100
101 /* ... or fall back the most general message. */
102 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
103 "Use '--' to separate paths from revisions, like this:\n"
104 "'git <command> [<revision>...] -- [<file>...]'", arg);
105
106 }
107
108 /*
109 * Verify a filename that we got as an argument for a pathspec
110 * entry. Note that a filename that begins with "-" never verifies
111 * as true, because even if such a filename were to exist, we want
112 * it to be preceded by the "--" marker (or we want the user to
113 * use a format like "./-filename")
114 *
115 * The "diagnose_misspelt_rev" is used to provide a user-friendly
116 * diagnosis when dying upon finding that "name" is not a pathname.
117 * If set to 1, the diagnosis will try to diagnose "name" as an
118 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
119 * will only complain about an inexisting file.
120 *
121 * This function is typically called to check that a "file or rev"
122 * argument is unambiguous. In this case, the caller will want
123 * diagnose_misspelt_rev == 1 when verifying the first non-rev
124 * argument (which could have been a revision), and
125 * diagnose_misspelt_rev == 0 for the next ones (because we already
126 * saw a filename, there's not ambiguity anymore).
127 */
128 void verify_filename(const char *prefix,
129 const char *arg,
130 int diagnose_misspelt_rev)
131 {
132 if (*arg == '-')
133 die("bad flag '%s' used after filename", arg);
134 if (check_filename(prefix, arg))
135 return;
136 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
137 }
138
139 /*
140 * Opposite of the above: the command line did not have -- marker
141 * and we parsed the arg as a refname. It should not be interpretable
142 * as a filename.
143 */
144 void verify_non_filename(const char *prefix, const char *arg)
145 {
146 if (!is_inside_work_tree() || is_inside_git_dir())
147 return;
148 if (*arg == '-')
149 return; /* flag */
150 if (!check_filename(prefix, arg))
151 return;
152 die("ambiguous argument '%s': both revision and filename\n"
153 "Use '--' to separate paths from revisions, like this:\n"
154 "'git <command> [<revision>...] -- [<file>...]'", arg);
155 }
156
157 /*
158 * Magic pathspec
159 *
160 * NEEDSWORK: These need to be moved to dir.h or even to a new
161 * pathspec.h when we restructure get_pathspec() users to use the
162 * "struct pathspec" interface.
163 *
164 * Possible future magic semantics include stuff like:
165 *
166 * { PATHSPEC_NOGLOB, '!', "noglob" },
167 * { PATHSPEC_ICASE, '\0', "icase" },
168 * { PATHSPEC_RECURSIVE, '*', "recursive" },
169 * { PATHSPEC_REGEXP, '\0', "regexp" },
170 *
171 */
172 #define PATHSPEC_FROMTOP (1<<0)
173
174 static struct pathspec_magic {
175 unsigned bit;
176 char mnemonic; /* this cannot be ':'! */
177 const char *name;
178 } pathspec_magic[] = {
179 { PATHSPEC_FROMTOP, '/', "top" },
180 };
181
182 /*
183 * Take an element of a pathspec and check for magic signatures.
184 * Append the result to the prefix.
185 *
186 * For now, we only parse the syntax and throw out anything other than
187 * "top" magic.
188 *
189 * NEEDSWORK: This needs to be rewritten when we start migrating
190 * get_pathspec() users to use the "struct pathspec" interface. For
191 * example, a pathspec element may be marked as case-insensitive, but
192 * the prefix part must always match literally, and a single stupid
193 * string cannot express such a case.
194 */
195 static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
196 {
197 unsigned magic = 0;
198 const char *copyfrom = elt;
199 int i;
200
201 if (elt[0] != ':') {
202 ; /* nothing to do */
203 } else if (elt[1] == '(') {
204 /* longhand */
205 const char *nextat;
206 for (copyfrom = elt + 2;
207 *copyfrom && *copyfrom != ')';
208 copyfrom = nextat) {
209 size_t len = strcspn(copyfrom, ",)");
210 if (copyfrom[len] == ',')
211 nextat = copyfrom + len + 1;
212 else
213 /* handle ')' and '\0' */
214 nextat = copyfrom + len;
215 if (!len)
216 continue;
217 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
218 if (strlen(pathspec_magic[i].name) == len &&
219 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
220 magic |= pathspec_magic[i].bit;
221 break;
222 }
223 if (ARRAY_SIZE(pathspec_magic) <= i)
224 die("Invalid pathspec magic '%.*s' in '%s'",
225 (int) len, copyfrom, elt);
226 }
227 if (*copyfrom != ')')
228 die("Missing ')' at the end of pathspec magic in '%s'", elt);
229 copyfrom++;
230 } else {
231 /* shorthand */
232 for (copyfrom = elt + 1;
233 *copyfrom && *copyfrom != ':';
234 copyfrom++) {
235 char ch = *copyfrom;
236
237 if (!is_pathspec_magic(ch))
238 break;
239 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
240 if (pathspec_magic[i].mnemonic == ch) {
241 magic |= pathspec_magic[i].bit;
242 break;
243 }
244 if (ARRAY_SIZE(pathspec_magic) <= i)
245 die("Unimplemented pathspec magic '%c' in '%s'",
246 ch, elt);
247 }
248 if (*copyfrom == ':')
249 copyfrom++;
250 }
251
252 if (magic & PATHSPEC_FROMTOP)
253 return xstrdup(copyfrom);
254 else
255 return prefix_path(prefix, prefixlen, copyfrom);
256 }
257
258 /*
259 * N.B. get_pathspec() is deprecated in favor of the "struct pathspec"
260 * based interface - see pathspec_magic above.
261 *
262 * Arguments:
263 * - prefix - a path relative to the root of the working tree
264 * - pathspec - a list of paths underneath the prefix path
265 *
266 * Iterates over pathspec, prepending each path with prefix,
267 * and return the resulting list.
268 *
269 * If pathspec is empty, return a singleton list containing prefix.
270 *
271 * If pathspec and prefix are both empty, return an empty list.
272 *
273 * This is typically used by built-in commands such as add.c, in order
274 * to normalize argv arguments provided to the built-in into a list of
275 * paths to process, all relative to the root of the working tree.
276 */
277 const char **get_pathspec(const char *prefix, const char **pathspec)
278 {
279 const char *entry = *pathspec;
280 const char **src, **dst;
281 int prefixlen;
282
283 if (!prefix && !entry)
284 return NULL;
285
286 if (!entry) {
287 static const char *spec[2];
288 spec[0] = prefix;
289 spec[1] = NULL;
290 return spec;
291 }
292
293 /* Otherwise we have to re-write the entries.. */
294 src = pathspec;
295 dst = pathspec;
296 prefixlen = prefix ? strlen(prefix) : 0;
297 while (*src) {
298 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
299 src++;
300 }
301 *dst = NULL;
302 if (!*pathspec)
303 return NULL;
304 return pathspec;
305 }
306
307 /*
308 * Test if it looks like we're at a git directory.
309 * We want to see:
310 *
311 * - either an objects/ directory _or_ the proper
312 * GIT_OBJECT_DIRECTORY environment variable
313 * - a refs/ directory
314 * - either a HEAD symlink or a HEAD file that is formatted as
315 * a proper "ref:", or a regular file HEAD that has a properly
316 * formatted sha1 object name.
317 */
318 int is_git_directory(const char *suspect)
319 {
320 char path[PATH_MAX];
321 size_t len = strlen(suspect);
322
323 if (PATH_MAX <= len + strlen("/objects"))
324 die("Too long path: %.*s", 60, suspect);
325 strcpy(path, suspect);
326 if (getenv(DB_ENVIRONMENT)) {
327 if (access(getenv(DB_ENVIRONMENT), X_OK))
328 return 0;
329 }
330 else {
331 strcpy(path + len, "/objects");
332 if (access(path, X_OK))
333 return 0;
334 }
335
336 strcpy(path + len, "/refs");
337 if (access(path, X_OK))
338 return 0;
339
340 strcpy(path + len, "/HEAD");
341 if (validate_headref(path))
342 return 0;
343
344 return 1;
345 }
346
347 int is_inside_git_dir(void)
348 {
349 if (inside_git_dir < 0)
350 inside_git_dir = is_inside_dir(get_git_dir());
351 return inside_git_dir;
352 }
353
354 int is_inside_work_tree(void)
355 {
356 if (inside_work_tree < 0)
357 inside_work_tree = is_inside_dir(get_git_work_tree());
358 return inside_work_tree;
359 }
360
361 void setup_work_tree(void)
362 {
363 struct strbuf sb = STRBUF_INIT;
364 const char *work_tree, *git_dir;
365 static int initialized = 0;
366
367 if (initialized)
368 return;
369 work_tree = get_git_work_tree();
370 git_dir = get_git_dir();
371 if (!is_absolute_path(git_dir))
372 git_dir = real_path(get_git_dir());
373 if (!work_tree || chdir(work_tree))
374 die("This operation must be run in a work tree");
375
376 /*
377 * Make sure subsequent git processes find correct worktree
378 * if $GIT_WORK_TREE is set relative
379 */
380 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
381 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
382
383 set_git_dir(relative_path(git_dir, work_tree, &sb));
384 initialized = 1;
385
386 strbuf_release(&sb);
387 }
388
389 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
390 {
391 char repo_config[PATH_MAX+1];
392
393 /*
394 * git_config() can't be used here because it calls git_pathdup()
395 * to get $GIT_CONFIG/config. That call will make setup_git_env()
396 * set git_dir to ".git".
397 *
398 * We are in gitdir setup, no git dir has been found useable yet.
399 * Use a gentler version of git_config() to check if this repo
400 * is a good one.
401 */
402 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
403 git_config_early(check_repository_format_version, NULL, repo_config);
404 if (GIT_REPO_VERSION < repository_format_version) {
405 if (!nongit_ok)
406 die ("Expected git repo version <= %d, found %d",
407 GIT_REPO_VERSION, repository_format_version);
408 warning("Expected git repo version <= %d, found %d",
409 GIT_REPO_VERSION, repository_format_version);
410 warning("Please upgrade Git");
411 *nongit_ok = -1;
412 return -1;
413 }
414 return 0;
415 }
416
417 /*
418 * Try to read the location of the git directory from the .git file,
419 * return path to git directory if found.
420 */
421 const char *read_gitfile(const char *path)
422 {
423 char *buf;
424 char *dir;
425 const char *slash;
426 struct stat st;
427 int fd;
428 ssize_t len;
429
430 if (stat(path, &st))
431 return NULL;
432 if (!S_ISREG(st.st_mode))
433 return NULL;
434 fd = open(path, O_RDONLY);
435 if (fd < 0)
436 die_errno("Error opening '%s'", path);
437 buf = xmalloc(st.st_size + 1);
438 len = read_in_full(fd, buf, st.st_size);
439 close(fd);
440 if (len != st.st_size)
441 die("Error reading %s", path);
442 buf[len] = '\0';
443 if (prefixcmp(buf, "gitdir: "))
444 die("Invalid gitfile format: %s", path);
445 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
446 len--;
447 if (len < 9)
448 die("No path in gitfile: %s", path);
449 buf[len] = '\0';
450 dir = buf + 8;
451
452 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
453 size_t pathlen = slash+1 - path;
454 size_t dirlen = pathlen + len - 8;
455 dir = xmalloc(dirlen + 1);
456 strncpy(dir, path, pathlen);
457 strncpy(dir + pathlen, buf + 8, len - 8);
458 dir[dirlen] = '\0';
459 free(buf);
460 buf = dir;
461 }
462
463 if (!is_git_directory(dir))
464 die("Not a git repository: %s", dir);
465 path = real_path(dir);
466
467 free(buf);
468 return path;
469 }
470
471 static const char *setup_explicit_git_dir(const char *gitdirenv,
472 char *cwd, int len,
473 int *nongit_ok)
474 {
475 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
476 const char *worktree;
477 char *gitfile;
478 int offset;
479
480 if (PATH_MAX - 40 < strlen(gitdirenv))
481 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
482
483 gitfile = (char*)read_gitfile(gitdirenv);
484 if (gitfile) {
485 gitfile = xstrdup(gitfile);
486 gitdirenv = gitfile;
487 }
488
489 if (!is_git_directory(gitdirenv)) {
490 if (nongit_ok) {
491 *nongit_ok = 1;
492 free(gitfile);
493 return NULL;
494 }
495 die("Not a git repository: '%s'", gitdirenv);
496 }
497
498 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
499 free(gitfile);
500 return NULL;
501 }
502
503 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
504 if (work_tree_env)
505 set_git_work_tree(work_tree_env);
506 else if (is_bare_repository_cfg > 0) {
507 if (git_work_tree_cfg) /* #22.2, #30 */
508 die("core.bare and core.worktree do not make sense");
509
510 /* #18, #26 */
511 set_git_dir(gitdirenv);
512 free(gitfile);
513 return NULL;
514 }
515 else if (git_work_tree_cfg) { /* #6, #14 */
516 if (is_absolute_path(git_work_tree_cfg))
517 set_git_work_tree(git_work_tree_cfg);
518 else {
519 char core_worktree[PATH_MAX];
520 if (chdir(gitdirenv))
521 die_errno("Could not chdir to '%s'", gitdirenv);
522 if (chdir(git_work_tree_cfg))
523 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
524 if (!getcwd(core_worktree, PATH_MAX))
525 die_errno("Could not get directory '%s'", git_work_tree_cfg);
526 if (chdir(cwd))
527 die_errno("Could not come back to cwd");
528 set_git_work_tree(core_worktree);
529 }
530 }
531 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
532 /* #16d */
533 set_git_dir(gitdirenv);
534 free(gitfile);
535 return NULL;
536 }
537 else /* #2, #10 */
538 set_git_work_tree(".");
539
540 /* set_git_work_tree() must have been called by now */
541 worktree = get_git_work_tree();
542
543 /* both get_git_work_tree() and cwd are already normalized */
544 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
545 set_git_dir(gitdirenv);
546 free(gitfile);
547 return NULL;
548 }
549
550 offset = dir_inside_of(cwd, worktree);
551 if (offset >= 0) { /* cwd inside worktree? */
552 set_git_dir(real_path(gitdirenv));
553 if (chdir(worktree))
554 die_errno("Could not chdir to '%s'", worktree);
555 cwd[len++] = '/';
556 cwd[len] = '\0';
557 free(gitfile);
558 return cwd + offset;
559 }
560
561 /* cwd outside worktree */
562 set_git_dir(gitdirenv);
563 free(gitfile);
564 return NULL;
565 }
566
567 static const char *setup_discovered_git_dir(const char *gitdir,
568 char *cwd, int offset, int len,
569 int *nongit_ok)
570 {
571 if (check_repository_format_gently(gitdir, nongit_ok))
572 return NULL;
573
574 /* --work-tree is set without --git-dir; use discovered one */
575 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
576 if (offset != len && !is_absolute_path(gitdir))
577 gitdir = xstrdup(real_path(gitdir));
578 if (chdir(cwd))
579 die_errno("Could not come back to cwd");
580 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
581 }
582
583 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
584 if (is_bare_repository_cfg > 0) {
585 set_git_dir(offset == len ? gitdir : real_path(gitdir));
586 if (chdir(cwd))
587 die_errno("Could not come back to cwd");
588 return NULL;
589 }
590
591 /* #0, #1, #5, #8, #9, #12, #13 */
592 set_git_work_tree(".");
593 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
594 set_git_dir(gitdir);
595 inside_git_dir = 0;
596 inside_work_tree = 1;
597 if (offset == len)
598 return NULL;
599
600 /* Make "offset" point to past the '/', and add a '/' at the end */
601 offset++;
602 cwd[len++] = '/';
603 cwd[len] = 0;
604 return cwd + offset;
605 }
606
607 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
608 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
609 {
610 int root_len;
611
612 if (check_repository_format_gently(".", nongit_ok))
613 return NULL;
614
615 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
616
617 /* --work-tree is set without --git-dir; use discovered one */
618 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
619 const char *gitdir;
620
621 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
622 if (chdir(cwd))
623 die_errno("Could not come back to cwd");
624 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
625 }
626
627 inside_git_dir = 1;
628 inside_work_tree = 0;
629 if (offset != len) {
630 if (chdir(cwd))
631 die_errno("Cannot come back to cwd");
632 root_len = offset_1st_component(cwd);
633 cwd[offset > root_len ? offset : root_len] = '\0';
634 set_git_dir(cwd);
635 }
636 else
637 set_git_dir(".");
638 return NULL;
639 }
640
641 static const char *setup_nongit(const char *cwd, int *nongit_ok)
642 {
643 if (!nongit_ok)
644 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
645 if (chdir(cwd))
646 die_errno("Cannot come back to cwd");
647 *nongit_ok = 1;
648 return NULL;
649 }
650
651 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
652 {
653 struct stat buf;
654 if (stat(path, &buf)) {
655 die_errno("failed to stat '%*s%s%s'",
656 prefix_len,
657 prefix ? prefix : "",
658 prefix ? "/" : "", path);
659 }
660 return buf.st_dev;
661 }
662
663 /*
664 * A "string_list_each_func_t" function that canonicalizes an entry
665 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
666 * discards it if unusable. The presence of an empty entry in
667 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
668 * subsequent entries.
669 */
670 static int canonicalize_ceiling_entry(struct string_list_item *item,
671 void *cb_data)
672 {
673 int *empty_entry_found = cb_data;
674 char *ceil = item->string;
675
676 if (!*ceil) {
677 *empty_entry_found = 1;
678 return 0;
679 } else if (!is_absolute_path(ceil)) {
680 return 0;
681 } else if (*empty_entry_found) {
682 /* Keep entry but do not canonicalize it */
683 return 1;
684 } else {
685 const char *real_path = real_path_if_valid(ceil);
686 if (!real_path)
687 return 0;
688 free(item->string);
689 item->string = xstrdup(real_path);
690 return 1;
691 }
692 }
693
694 /*
695 * We cannot decide in this function whether we are in the work tree or
696 * not, since the config can only be read _after_ this function was called.
697 */
698 static const char *setup_git_directory_gently_1(int *nongit_ok)
699 {
700 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
701 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
702 static char cwd[PATH_MAX+1];
703 const char *gitdirenv, *ret;
704 char *gitfile;
705 int len, offset, offset_parent, ceil_offset = -1;
706 dev_t current_device = 0;
707 int one_filesystem = 1;
708
709 /*
710 * Let's assume that we are in a git repository.
711 * If it turns out later that we are somewhere else, the value will be
712 * updated accordingly.
713 */
714 if (nongit_ok)
715 *nongit_ok = 0;
716
717 if (!getcwd(cwd, sizeof(cwd)-1))
718 die_errno("Unable to read current working directory");
719 offset = len = strlen(cwd);
720
721 /*
722 * If GIT_DIR is set explicitly, we're not going
723 * to do any discovery, but we still do repository
724 * validation.
725 */
726 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
727 if (gitdirenv)
728 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
729
730 if (env_ceiling_dirs) {
731 int empty_entry_found = 0;
732
733 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
734 filter_string_list(&ceiling_dirs, 0,
735 canonicalize_ceiling_entry, &empty_entry_found);
736 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
737 string_list_clear(&ceiling_dirs, 0);
738 }
739
740 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
741 ceil_offset = 1;
742
743 /*
744 * Test in the following order (relative to the cwd):
745 * - .git (file containing "gitdir: <path>")
746 * - .git/
747 * - ./ (bare)
748 * - ../.git
749 * - ../.git/
750 * - ../ (bare)
751 * - ../../.git/
752 * etc.
753 */
754 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
755 if (one_filesystem)
756 current_device = get_device_or_die(".", NULL, 0);
757 for (;;) {
758 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
759 if (gitfile)
760 gitdirenv = gitfile = xstrdup(gitfile);
761 else {
762 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
763 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
764 }
765
766 if (gitdirenv) {
767 ret = setup_discovered_git_dir(gitdirenv,
768 cwd, offset, len,
769 nongit_ok);
770 free(gitfile);
771 return ret;
772 }
773 free(gitfile);
774
775 if (is_git_directory("."))
776 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
777
778 offset_parent = offset;
779 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
780 if (offset_parent <= ceil_offset)
781 return setup_nongit(cwd, nongit_ok);
782 if (one_filesystem) {
783 dev_t parent_device = get_device_or_die("..", cwd, offset);
784 if (parent_device != current_device) {
785 if (nongit_ok) {
786 if (chdir(cwd))
787 die_errno("Cannot come back to cwd");
788 *nongit_ok = 1;
789 return NULL;
790 }
791 cwd[offset] = '\0';
792 die("Not a git repository (or any parent up to mount point %s)\n"
793 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
794 }
795 }
796 if (chdir("..")) {
797 cwd[offset] = '\0';
798 die_errno("Cannot change to '%s/..'", cwd);
799 }
800 offset = offset_parent;
801 }
802 }
803
804 const char *setup_git_directory_gently(int *nongit_ok)
805 {
806 const char *prefix;
807
808 prefix = setup_git_directory_gently_1(nongit_ok);
809 if (prefix)
810 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
811 else
812 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
813
814 if (startup_info) {
815 startup_info->have_repository = !nongit_ok || !*nongit_ok;
816 startup_info->prefix = prefix;
817 }
818 return prefix;
819 }
820
821 int git_config_perm(const char *var, const char *value)
822 {
823 int i;
824 char *endptr;
825
826 if (value == NULL)
827 return PERM_GROUP;
828
829 if (!strcmp(value, "umask"))
830 return PERM_UMASK;
831 if (!strcmp(value, "group"))
832 return PERM_GROUP;
833 if (!strcmp(value, "all") ||
834 !strcmp(value, "world") ||
835 !strcmp(value, "everybody"))
836 return PERM_EVERYBODY;
837
838 /* Parse octal numbers */
839 i = strtol(value, &endptr, 8);
840
841 /* If not an octal number, maybe true/false? */
842 if (*endptr != 0)
843 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
844
845 /*
846 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
847 * a chmod value to restrict to.
848 */
849 switch (i) {
850 case PERM_UMASK: /* 0 */
851 return PERM_UMASK;
852 case OLD_PERM_GROUP: /* 1 */
853 return PERM_GROUP;
854 case OLD_PERM_EVERYBODY: /* 2 */
855 return PERM_EVERYBODY;
856 }
857
858 /* A filemode value was given: 0xxx */
859
860 if ((i & 0600) != 0600)
861 die("Problem with core.sharedRepository filemode value "
862 "(0%.3o).\nThe owner of files must always have "
863 "read and write permissions.", i);
864
865 /*
866 * Mask filemode value. Others can not get write permission.
867 * x flags for directories are handled separately.
868 */
869 return -(i & 0666);
870 }
871
872 int check_repository_format_version(const char *var, const char *value, void *cb)
873 {
874 if (strcmp(var, "core.repositoryformatversion") == 0)
875 repository_format_version = git_config_int(var, value);
876 else if (strcmp(var, "core.sharedrepository") == 0)
877 shared_repository = git_config_perm(var, value);
878 else if (strcmp(var, "core.bare") == 0) {
879 is_bare_repository_cfg = git_config_bool(var, value);
880 if (is_bare_repository_cfg == 1)
881 inside_work_tree = -1;
882 } else if (strcmp(var, "core.worktree") == 0) {
883 if (!value)
884 return config_error_nonbool(var);
885 free(git_work_tree_cfg);
886 git_work_tree_cfg = xstrdup(value);
887 inside_work_tree = -1;
888 }
889 return 0;
890 }
891
892 int check_repository_format(void)
893 {
894 return check_repository_format_gently(get_git_dir(), NULL);
895 }
896
897 /*
898 * Returns the "prefix", a path to the current working directory
899 * relative to the work tree root, or NULL, if the current working
900 * directory is not a strict subdirectory of the work tree root. The
901 * prefix always ends with a '/' character.
902 */
903 const char *setup_git_directory(void)
904 {
905 return setup_git_directory_gently(NULL);
906 }
907
908 const char *resolve_gitdir(const char *suspect)
909 {
910 if (is_git_directory(suspect))
911 return suspect;
912 return read_gitfile(suspect);
913 }
914
915 /* if any standard file descriptor is missing open it to /dev/null */
916 void sanitize_stdfds(void)
917 {
918 int fd = open("/dev/null", O_RDWR, 0);
919 while (fd != -1 && fd < 2)
920 fd = dup(fd);
921 if (fd == -1)
922 die_errno("open /dev/null or dup failed");
923 if (fd > 2)
924 close(fd);
925 }