Merge branch 'cb/do-not-use-test-cmp-with-a'
[git/git.git] / setup.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "dir.h"
5 #include "string-list.h"
6 #include "chdir-notify.h"
7 #include "promisor-remote.h"
8
9 static int inside_git_dir = -1;
10 static int inside_work_tree = -1;
11 static int work_tree_config_is_bogus;
12
13 static struct startup_info the_startup_info;
14 struct startup_info *startup_info = &the_startup_info;
15
16 /*
17 * The input parameter must contain an absolute path, and it must already be
18 * normalized.
19 *
20 * Find the part of an absolute path that lies inside the work tree by
21 * dereferencing symlinks outside the work tree, for example:
22 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
23 * /dir/file (work tree is /) -> dir/file
24 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
25 * /dir/repolink/file (repolink points to /dir/repo) -> file
26 * /dir/repo (exactly equal to work tree) -> (empty string)
27 */
28 static int abspath_part_inside_repo(char *path)
29 {
30 size_t len;
31 size_t wtlen;
32 char *path0;
33 int off;
34 const char *work_tree = get_git_work_tree();
35
36 if (!work_tree)
37 return -1;
38 wtlen = strlen(work_tree);
39 len = strlen(path);
40 off = offset_1st_component(path);
41
42 /* check if work tree is already the prefix */
43 if (wtlen <= len && !fspathncmp(path, work_tree, wtlen)) {
44 if (path[wtlen] == '/') {
45 memmove(path, path + wtlen + 1, len - wtlen);
46 return 0;
47 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
48 /* work tree is the root, or the whole path */
49 memmove(path, path + wtlen, len - wtlen + 1);
50 return 0;
51 }
52 /* work tree might match beginning of a symlink to work tree */
53 off = wtlen;
54 }
55 path0 = path;
56 path += off;
57
58 /* check each '/'-terminated level */
59 while (*path) {
60 path++;
61 if (*path == '/') {
62 *path = '\0';
63 if (fspathcmp(real_path(path0), work_tree) == 0) {
64 memmove(path0, path + 1, len - (path - path0));
65 return 0;
66 }
67 *path = '/';
68 }
69 }
70
71 /* check whole path */
72 if (fspathcmp(real_path(path0), work_tree) == 0) {
73 *path0 = '\0';
74 return 0;
75 }
76
77 return -1;
78 }
79
80 /*
81 * Normalize "path", prepending the "prefix" for relative paths. If
82 * remaining_prefix is not NULL, return the actual prefix still
83 * remains in the path. For example, prefix = sub1/sub2/ and path is
84 *
85 * foo -> sub1/sub2/foo (full prefix)
86 * ../foo -> sub1/foo (remaining prefix is sub1/)
87 * ../../bar -> bar (no remaining prefix)
88 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
89 * `pwd`/../bar -> sub1/bar (no remaining prefix)
90 */
91 char *prefix_path_gently(const char *prefix, int len,
92 int *remaining_prefix, const char *path)
93 {
94 const char *orig = path;
95 char *sanitized;
96 if (is_absolute_path(orig)) {
97 sanitized = xmallocz(strlen(path));
98 if (remaining_prefix)
99 *remaining_prefix = 0;
100 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
101 free(sanitized);
102 return NULL;
103 }
104 if (abspath_part_inside_repo(sanitized)) {
105 free(sanitized);
106 return NULL;
107 }
108 } else {
109 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
110 if (remaining_prefix)
111 *remaining_prefix = len;
112 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
113 free(sanitized);
114 return NULL;
115 }
116 }
117 return sanitized;
118 }
119
120 char *prefix_path(const char *prefix, int len, const char *path)
121 {
122 char *r = prefix_path_gently(prefix, len, NULL, path);
123 if (!r)
124 die(_("'%s' is outside repository"), path);
125 return r;
126 }
127
128 int path_inside_repo(const char *prefix, const char *path)
129 {
130 int len = prefix ? strlen(prefix) : 0;
131 char *r = prefix_path_gently(prefix, len, NULL, path);
132 if (r) {
133 free(r);
134 return 1;
135 }
136 return 0;
137 }
138
139 int check_filename(const char *prefix, const char *arg)
140 {
141 char *to_free = NULL;
142 struct stat st;
143
144 if (skip_prefix(arg, ":/", &arg)) {
145 if (!*arg) /* ":/" is root dir, always exists */
146 return 1;
147 prefix = NULL;
148 } else if (skip_prefix(arg, ":!", &arg) ||
149 skip_prefix(arg, ":^", &arg)) {
150 if (!*arg) /* excluding everything is silly, but allowed */
151 return 1;
152 }
153
154 if (prefix)
155 arg = to_free = prefix_filename(prefix, arg);
156
157 if (!lstat(arg, &st)) {
158 free(to_free);
159 return 1; /* file exists */
160 }
161 if (is_missing_file_error(errno)) {
162 free(to_free);
163 return 0; /* file does not exist */
164 }
165 die_errno(_("failed to stat '%s'"), arg);
166 }
167
168 static void NORETURN die_verify_filename(struct repository *r,
169 const char *prefix,
170 const char *arg,
171 int diagnose_misspelt_rev)
172 {
173 if (!diagnose_misspelt_rev)
174 die(_("%s: no such path in the working tree.\n"
175 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
176 arg);
177 /*
178 * Saying "'(icase)foo' does not exist in the index" when the
179 * user gave us ":(icase)foo" is just stupid. A magic pathspec
180 * begins with a colon and is followed by a non-alnum; do not
181 * let maybe_die_on_misspelt_object_name() even trigger.
182 */
183 if (!(arg[0] == ':' && !isalnum(arg[1])))
184 maybe_die_on_misspelt_object_name(r, arg, prefix);
185
186 /* ... or fall back the most general message. */
187 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
188 "Use '--' to separate paths from revisions, like this:\n"
189 "'git <command> [<revision>...] -- [<file>...]'"), arg);
190
191 }
192
193 /*
194 * Check for arguments that don't resolve as actual files,
195 * but which look sufficiently like pathspecs that we'll consider
196 * them such for the purposes of rev/pathspec DWIM parsing.
197 */
198 static int looks_like_pathspec(const char *arg)
199 {
200 /* anything with a wildcard character */
201 if (!no_wildcard(arg))
202 return 1;
203
204 /* long-form pathspec magic */
205 if (starts_with(arg, ":("))
206 return 1;
207
208 return 0;
209 }
210
211 /*
212 * Verify a filename that we got as an argument for a pathspec
213 * entry. Note that a filename that begins with "-" never verifies
214 * as true, because even if such a filename were to exist, we want
215 * it to be preceded by the "--" marker (or we want the user to
216 * use a format like "./-filename")
217 *
218 * The "diagnose_misspelt_rev" is used to provide a user-friendly
219 * diagnosis when dying upon finding that "name" is not a pathname.
220 * If set to 1, the diagnosis will try to diagnose "name" as an
221 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
222 * will only complain about an inexisting file.
223 *
224 * This function is typically called to check that a "file or rev"
225 * argument is unambiguous. In this case, the caller will want
226 * diagnose_misspelt_rev == 1 when verifying the first non-rev
227 * argument (which could have been a revision), and
228 * diagnose_misspelt_rev == 0 for the next ones (because we already
229 * saw a filename, there's not ambiguity anymore).
230 */
231 void verify_filename(const char *prefix,
232 const char *arg,
233 int diagnose_misspelt_rev)
234 {
235 if (*arg == '-')
236 die(_("option '%s' must come before non-option arguments"), arg);
237 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
238 return;
239 die_verify_filename(the_repository, prefix, arg, diagnose_misspelt_rev);
240 }
241
242 /*
243 * Opposite of the above: the command line did not have -- marker
244 * and we parsed the arg as a refname. It should not be interpretable
245 * as a filename.
246 */
247 void verify_non_filename(const char *prefix, const char *arg)
248 {
249 if (!is_inside_work_tree() || is_inside_git_dir())
250 return;
251 if (*arg == '-')
252 return; /* flag */
253 if (!check_filename(prefix, arg))
254 return;
255 die(_("ambiguous argument '%s': both revision and filename\n"
256 "Use '--' to separate paths from revisions, like this:\n"
257 "'git <command> [<revision>...] -- [<file>...]'"), arg);
258 }
259
260 int get_common_dir(struct strbuf *sb, const char *gitdir)
261 {
262 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
263 if (git_env_common_dir) {
264 strbuf_addstr(sb, git_env_common_dir);
265 return 1;
266 } else {
267 return get_common_dir_noenv(sb, gitdir);
268 }
269 }
270
271 int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
272 {
273 struct strbuf data = STRBUF_INIT;
274 struct strbuf path = STRBUF_INIT;
275 int ret = 0;
276
277 strbuf_addf(&path, "%s/commondir", gitdir);
278 if (file_exists(path.buf)) {
279 if (strbuf_read_file(&data, path.buf, 0) <= 0)
280 die_errno(_("failed to read %s"), path.buf);
281 while (data.len && (data.buf[data.len - 1] == '\n' ||
282 data.buf[data.len - 1] == '\r'))
283 data.len--;
284 data.buf[data.len] = '\0';
285 strbuf_reset(&path);
286 if (!is_absolute_path(data.buf))
287 strbuf_addf(&path, "%s/", gitdir);
288 strbuf_addbuf(&path, &data);
289 strbuf_add_real_path(sb, path.buf);
290 ret = 1;
291 } else {
292 strbuf_addstr(sb, gitdir);
293 }
294
295 strbuf_release(&data);
296 strbuf_release(&path);
297 return ret;
298 }
299
300 /*
301 * Test if it looks like we're at a git directory.
302 * We want to see:
303 *
304 * - either an objects/ directory _or_ the proper
305 * GIT_OBJECT_DIRECTORY environment variable
306 * - a refs/ directory
307 * - either a HEAD symlink or a HEAD file that is formatted as
308 * a proper "ref:", or a regular file HEAD that has a properly
309 * formatted sha1 object name.
310 */
311 int is_git_directory(const char *suspect)
312 {
313 struct strbuf path = STRBUF_INIT;
314 int ret = 0;
315 size_t len;
316
317 /* Check worktree-related signatures */
318 strbuf_addstr(&path, suspect);
319 strbuf_complete(&path, '/');
320 strbuf_addstr(&path, "HEAD");
321 if (validate_headref(path.buf))
322 goto done;
323
324 strbuf_reset(&path);
325 get_common_dir(&path, suspect);
326 len = path.len;
327
328 /* Check non-worktree-related signatures */
329 if (getenv(DB_ENVIRONMENT)) {
330 if (access(getenv(DB_ENVIRONMENT), X_OK))
331 goto done;
332 }
333 else {
334 strbuf_setlen(&path, len);
335 strbuf_addstr(&path, "/objects");
336 if (access(path.buf, X_OK))
337 goto done;
338 }
339
340 strbuf_setlen(&path, len);
341 strbuf_addstr(&path, "/refs");
342 if (access(path.buf, X_OK))
343 goto done;
344
345 ret = 1;
346 done:
347 strbuf_release(&path);
348 return ret;
349 }
350
351 int is_nonbare_repository_dir(struct strbuf *path)
352 {
353 int ret = 0;
354 int gitfile_error;
355 size_t orig_path_len = path->len;
356 assert(orig_path_len != 0);
357 strbuf_complete(path, '/');
358 strbuf_addstr(path, ".git");
359 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
360 ret = 1;
361 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
362 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
363 ret = 1;
364 strbuf_setlen(path, orig_path_len);
365 return ret;
366 }
367
368 int is_inside_git_dir(void)
369 {
370 if (inside_git_dir < 0)
371 inside_git_dir = is_inside_dir(get_git_dir());
372 return inside_git_dir;
373 }
374
375 int is_inside_work_tree(void)
376 {
377 if (inside_work_tree < 0)
378 inside_work_tree = is_inside_dir(get_git_work_tree());
379 return inside_work_tree;
380 }
381
382 void setup_work_tree(void)
383 {
384 const char *work_tree;
385 static int initialized = 0;
386
387 if (initialized)
388 return;
389
390 if (work_tree_config_is_bogus)
391 die(_("unable to set up work tree using invalid config"));
392
393 work_tree = get_git_work_tree();
394 if (!work_tree || chdir_notify(work_tree))
395 die(_("this operation must be run in a work tree"));
396
397 /*
398 * Make sure subsequent git processes find correct worktree
399 * if $GIT_WORK_TREE is set relative
400 */
401 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
402 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
403
404 initialized = 1;
405 }
406
407 static int read_worktree_config(const char *var, const char *value, void *vdata)
408 {
409 struct repository_format *data = vdata;
410
411 if (strcmp(var, "core.bare") == 0) {
412 data->is_bare = git_config_bool(var, value);
413 } else if (strcmp(var, "core.worktree") == 0) {
414 if (!value)
415 return config_error_nonbool(var);
416 free(data->work_tree);
417 data->work_tree = xstrdup(value);
418 }
419 return 0;
420 }
421
422 static int check_repo_format(const char *var, const char *value, void *vdata)
423 {
424 struct repository_format *data = vdata;
425 const char *ext;
426
427 if (strcmp(var, "core.repositoryformatversion") == 0)
428 data->version = git_config_int(var, value);
429 else if (skip_prefix(var, "extensions.", &ext)) {
430 /*
431 * record any known extensions here; otherwise,
432 * we fall through to recording it as unknown, and
433 * check_repository_format will complain
434 */
435 if (!strcmp(ext, "noop"))
436 ;
437 else if (!strcmp(ext, "preciousobjects"))
438 data->precious_objects = git_config_bool(var, value);
439 else if (!strcmp(ext, "partialclone")) {
440 if (!value)
441 return config_error_nonbool(var);
442 data->partial_clone = xstrdup(value);
443 } else if (!strcmp(ext, "worktreeconfig"))
444 data->worktree_config = git_config_bool(var, value);
445 else
446 string_list_append(&data->unknown_extensions, ext);
447 }
448
449 return read_worktree_config(var, value, vdata);
450 }
451
452 static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
453 {
454 struct strbuf sb = STRBUF_INIT;
455 struct strbuf err = STRBUF_INIT;
456 int has_common;
457
458 has_common = get_common_dir(&sb, gitdir);
459 strbuf_addstr(&sb, "/config");
460 read_repository_format(candidate, sb.buf);
461 strbuf_release(&sb);
462
463 /*
464 * For historical use of check_repository_format() in git-init,
465 * we treat a missing config as a silent "ok", even when nongit_ok
466 * is unset.
467 */
468 if (candidate->version < 0)
469 return 0;
470
471 if (verify_repository_format(candidate, &err) < 0) {
472 if (nongit_ok) {
473 warning("%s", err.buf);
474 strbuf_release(&err);
475 *nongit_ok = -1;
476 return -1;
477 }
478 die("%s", err.buf);
479 }
480
481 repository_format_precious_objects = candidate->precious_objects;
482 set_repository_format_partial_clone(candidate->partial_clone);
483 repository_format_worktree_config = candidate->worktree_config;
484 string_list_clear(&candidate->unknown_extensions, 0);
485
486 if (repository_format_worktree_config) {
487 /*
488 * pick up core.bare and core.worktree from per-worktree
489 * config if present
490 */
491 strbuf_addf(&sb, "%s/config.worktree", gitdir);
492 git_config_from_file(read_worktree_config, sb.buf, candidate);
493 strbuf_release(&sb);
494 has_common = 0;
495 }
496
497 if (!has_common) {
498 if (candidate->is_bare != -1) {
499 is_bare_repository_cfg = candidate->is_bare;
500 if (is_bare_repository_cfg == 1)
501 inside_work_tree = -1;
502 }
503 if (candidate->work_tree) {
504 free(git_work_tree_cfg);
505 git_work_tree_cfg = xstrdup(candidate->work_tree);
506 inside_work_tree = -1;
507 }
508 }
509
510 return 0;
511 }
512
513 static void init_repository_format(struct repository_format *format)
514 {
515 const struct repository_format fresh = REPOSITORY_FORMAT_INIT;
516
517 memcpy(format, &fresh, sizeof(fresh));
518 }
519
520 int read_repository_format(struct repository_format *format, const char *path)
521 {
522 clear_repository_format(format);
523 git_config_from_file(check_repo_format, path, format);
524 if (format->version == -1)
525 clear_repository_format(format);
526 return format->version;
527 }
528
529 void clear_repository_format(struct repository_format *format)
530 {
531 string_list_clear(&format->unknown_extensions, 0);
532 free(format->work_tree);
533 free(format->partial_clone);
534 init_repository_format(format);
535 }
536
537 int verify_repository_format(const struct repository_format *format,
538 struct strbuf *err)
539 {
540 if (GIT_REPO_VERSION_READ < format->version) {
541 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
542 GIT_REPO_VERSION_READ, format->version);
543 return -1;
544 }
545
546 if (format->version >= 1 && format->unknown_extensions.nr) {
547 int i;
548
549 strbuf_addstr(err, _("unknown repository extensions found:"));
550
551 for (i = 0; i < format->unknown_extensions.nr; i++)
552 strbuf_addf(err, "\n\t%s",
553 format->unknown_extensions.items[i].string);
554 return -1;
555 }
556
557 return 0;
558 }
559
560 void read_gitfile_error_die(int error_code, const char *path, const char *dir)
561 {
562 switch (error_code) {
563 case READ_GITFILE_ERR_STAT_FAILED:
564 case READ_GITFILE_ERR_NOT_A_FILE:
565 /* non-fatal; follow return path */
566 break;
567 case READ_GITFILE_ERR_OPEN_FAILED:
568 die_errno(_("error opening '%s'"), path);
569 case READ_GITFILE_ERR_TOO_LARGE:
570 die(_("too large to be a .git file: '%s'"), path);
571 case READ_GITFILE_ERR_READ_FAILED:
572 die(_("error reading %s"), path);
573 case READ_GITFILE_ERR_INVALID_FORMAT:
574 die(_("invalid gitfile format: %s"), path);
575 case READ_GITFILE_ERR_NO_PATH:
576 die(_("no path in gitfile: %s"), path);
577 case READ_GITFILE_ERR_NOT_A_REPO:
578 die(_("not a git repository: %s"), dir);
579 default:
580 BUG("unknown error code");
581 }
582 }
583
584 /*
585 * Try to read the location of the git directory from the .git file,
586 * return path to git directory if found. The return value comes from
587 * a shared buffer.
588 *
589 * On failure, if return_error_code is not NULL, return_error_code
590 * will be set to an error code and NULL will be returned. If
591 * return_error_code is NULL the function will die instead (for most
592 * cases).
593 */
594 const char *read_gitfile_gently(const char *path, int *return_error_code)
595 {
596 const int max_file_size = 1 << 20; /* 1MB */
597 int error_code = 0;
598 char *buf = NULL;
599 char *dir = NULL;
600 const char *slash;
601 struct stat st;
602 int fd;
603 ssize_t len;
604
605 if (stat(path, &st)) {
606 /* NEEDSWORK: discern between ENOENT vs other errors */
607 error_code = READ_GITFILE_ERR_STAT_FAILED;
608 goto cleanup_return;
609 }
610 if (!S_ISREG(st.st_mode)) {
611 error_code = READ_GITFILE_ERR_NOT_A_FILE;
612 goto cleanup_return;
613 }
614 if (st.st_size > max_file_size) {
615 error_code = READ_GITFILE_ERR_TOO_LARGE;
616 goto cleanup_return;
617 }
618 fd = open(path, O_RDONLY);
619 if (fd < 0) {
620 error_code = READ_GITFILE_ERR_OPEN_FAILED;
621 goto cleanup_return;
622 }
623 buf = xmallocz(st.st_size);
624 len = read_in_full(fd, buf, st.st_size);
625 close(fd);
626 if (len != st.st_size) {
627 error_code = READ_GITFILE_ERR_READ_FAILED;
628 goto cleanup_return;
629 }
630 if (!starts_with(buf, "gitdir: ")) {
631 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
632 goto cleanup_return;
633 }
634 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
635 len--;
636 if (len < 9) {
637 error_code = READ_GITFILE_ERR_NO_PATH;
638 goto cleanup_return;
639 }
640 buf[len] = '\0';
641 dir = buf + 8;
642
643 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
644 size_t pathlen = slash+1 - path;
645 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
646 (int)(len - 8), buf + 8);
647 free(buf);
648 buf = dir;
649 }
650 if (!is_git_directory(dir)) {
651 error_code = READ_GITFILE_ERR_NOT_A_REPO;
652 goto cleanup_return;
653 }
654 path = real_path(dir);
655
656 cleanup_return:
657 if (return_error_code)
658 *return_error_code = error_code;
659 else if (error_code)
660 read_gitfile_error_die(error_code, path, dir);
661
662 free(buf);
663 return error_code ? NULL : path;
664 }
665
666 static const char *setup_explicit_git_dir(const char *gitdirenv,
667 struct strbuf *cwd,
668 struct repository_format *repo_fmt,
669 int *nongit_ok)
670 {
671 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
672 const char *worktree;
673 char *gitfile;
674 int offset;
675
676 if (PATH_MAX - 40 < strlen(gitdirenv))
677 die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT);
678
679 gitfile = (char*)read_gitfile(gitdirenv);
680 if (gitfile) {
681 gitfile = xstrdup(gitfile);
682 gitdirenv = gitfile;
683 }
684
685 if (!is_git_directory(gitdirenv)) {
686 if (nongit_ok) {
687 *nongit_ok = 1;
688 free(gitfile);
689 return NULL;
690 }
691 die(_("not a git repository: '%s'"), gitdirenv);
692 }
693
694 if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) {
695 free(gitfile);
696 return NULL;
697 }
698
699 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
700 if (work_tree_env)
701 set_git_work_tree(work_tree_env);
702 else if (is_bare_repository_cfg > 0) {
703 if (git_work_tree_cfg) {
704 /* #22.2, #30 */
705 warning("core.bare and core.worktree do not make sense");
706 work_tree_config_is_bogus = 1;
707 }
708
709 /* #18, #26 */
710 set_git_dir(gitdirenv);
711 free(gitfile);
712 return NULL;
713 }
714 else if (git_work_tree_cfg) { /* #6, #14 */
715 if (is_absolute_path(git_work_tree_cfg))
716 set_git_work_tree(git_work_tree_cfg);
717 else {
718 char *core_worktree;
719 if (chdir(gitdirenv))
720 die_errno(_("cannot chdir to '%s'"), gitdirenv);
721 if (chdir(git_work_tree_cfg))
722 die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg);
723 core_worktree = xgetcwd();
724 if (chdir(cwd->buf))
725 die_errno(_("cannot come back to cwd"));
726 set_git_work_tree(core_worktree);
727 free(core_worktree);
728 }
729 }
730 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
731 /* #16d */
732 set_git_dir(gitdirenv);
733 free(gitfile);
734 return NULL;
735 }
736 else /* #2, #10 */
737 set_git_work_tree(".");
738
739 /* set_git_work_tree() must have been called by now */
740 worktree = get_git_work_tree();
741
742 /* both get_git_work_tree() and cwd are already normalized */
743 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
744 set_git_dir(gitdirenv);
745 free(gitfile);
746 return NULL;
747 }
748
749 offset = dir_inside_of(cwd->buf, worktree);
750 if (offset >= 0) { /* cwd inside worktree? */
751 set_git_dir(real_path(gitdirenv));
752 if (chdir(worktree))
753 die_errno(_("cannot chdir to '%s'"), worktree);
754 strbuf_addch(cwd, '/');
755 free(gitfile);
756 return cwd->buf + offset;
757 }
758
759 /* cwd outside worktree */
760 set_git_dir(gitdirenv);
761 free(gitfile);
762 return NULL;
763 }
764
765 static const char *setup_discovered_git_dir(const char *gitdir,
766 struct strbuf *cwd, int offset,
767 struct repository_format *repo_fmt,
768 int *nongit_ok)
769 {
770 if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok))
771 return NULL;
772
773 /* --work-tree is set without --git-dir; use discovered one */
774 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
775 char *to_free = NULL;
776 const char *ret;
777
778 if (offset != cwd->len && !is_absolute_path(gitdir))
779 gitdir = to_free = real_pathdup(gitdir, 1);
780 if (chdir(cwd->buf))
781 die_errno(_("cannot come back to cwd"));
782 ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
783 free(to_free);
784 return ret;
785 }
786
787 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
788 if (is_bare_repository_cfg > 0) {
789 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
790 if (chdir(cwd->buf))
791 die_errno(_("cannot come back to cwd"));
792 return NULL;
793 }
794
795 /* #0, #1, #5, #8, #9, #12, #13 */
796 set_git_work_tree(".");
797 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
798 set_git_dir(gitdir);
799 inside_git_dir = 0;
800 inside_work_tree = 1;
801 if (offset >= cwd->len)
802 return NULL;
803
804 /* Make "offset" point past the '/' (already the case for root dirs) */
805 if (offset != offset_1st_component(cwd->buf))
806 offset++;
807 /* Add a '/' at the end */
808 strbuf_addch(cwd, '/');
809 return cwd->buf + offset;
810 }
811
812 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
813 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
814 struct repository_format *repo_fmt,
815 int *nongit_ok)
816 {
817 int root_len;
818
819 if (check_repository_format_gently(".", repo_fmt, nongit_ok))
820 return NULL;
821
822 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
823
824 /* --work-tree is set without --git-dir; use discovered one */
825 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
826 static const char *gitdir;
827
828 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
829 if (chdir(cwd->buf))
830 die_errno(_("cannot come back to cwd"));
831 return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
832 }
833
834 inside_git_dir = 1;
835 inside_work_tree = 0;
836 if (offset != cwd->len) {
837 if (chdir(cwd->buf))
838 die_errno(_("cannot come back to cwd"));
839 root_len = offset_1st_component(cwd->buf);
840 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
841 set_git_dir(cwd->buf);
842 }
843 else
844 set_git_dir(".");
845 return NULL;
846 }
847
848 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
849 {
850 struct stat buf;
851 if (stat(path, &buf)) {
852 die_errno(_("failed to stat '%*s%s%s'"),
853 prefix_len,
854 prefix ? prefix : "",
855 prefix ? "/" : "", path);
856 }
857 return buf.st_dev;
858 }
859
860 /*
861 * A "string_list_each_func_t" function that canonicalizes an entry
862 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
863 * discards it if unusable. The presence of an empty entry in
864 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
865 * subsequent entries.
866 */
867 static int canonicalize_ceiling_entry(struct string_list_item *item,
868 void *cb_data)
869 {
870 int *empty_entry_found = cb_data;
871 char *ceil = item->string;
872
873 if (!*ceil) {
874 *empty_entry_found = 1;
875 return 0;
876 } else if (!is_absolute_path(ceil)) {
877 return 0;
878 } else if (*empty_entry_found) {
879 /* Keep entry but do not canonicalize it */
880 return 1;
881 } else {
882 char *real_path = real_pathdup(ceil, 0);
883 if (!real_path) {
884 return 0;
885 }
886 free(item->string);
887 item->string = real_path;
888 return 1;
889 }
890 }
891
892 enum discovery_result {
893 GIT_DIR_NONE = 0,
894 GIT_DIR_EXPLICIT,
895 GIT_DIR_DISCOVERED,
896 GIT_DIR_BARE,
897 /* these are errors */
898 GIT_DIR_HIT_CEILING = -1,
899 GIT_DIR_HIT_MOUNT_POINT = -2,
900 GIT_DIR_INVALID_GITFILE = -3
901 };
902
903 /*
904 * We cannot decide in this function whether we are in the work tree or
905 * not, since the config can only be read _after_ this function was called.
906 *
907 * Also, we avoid changing any global state (such as the current working
908 * directory) to allow early callers.
909 *
910 * The directory where the search should start needs to be passed in via the
911 * `dir` parameter; upon return, the `dir` buffer will contain the path of
912 * the directory where the search ended, and `gitdir` will contain the path of
913 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
914 * is relative to `dir` (i.e. *not* necessarily the cwd).
915 */
916 static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
917 struct strbuf *gitdir,
918 int die_on_error)
919 {
920 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
921 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
922 const char *gitdirenv;
923 int ceil_offset = -1, min_offset = offset_1st_component(dir->buf);
924 dev_t current_device = 0;
925 int one_filesystem = 1;
926
927 /*
928 * If GIT_DIR is set explicitly, we're not going
929 * to do any discovery, but we still do repository
930 * validation.
931 */
932 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
933 if (gitdirenv) {
934 strbuf_addstr(gitdir, gitdirenv);
935 return GIT_DIR_EXPLICIT;
936 }
937
938 if (env_ceiling_dirs) {
939 int empty_entry_found = 0;
940
941 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
942 filter_string_list(&ceiling_dirs, 0,
943 canonicalize_ceiling_entry, &empty_entry_found);
944 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
945 string_list_clear(&ceiling_dirs, 0);
946 }
947
948 if (ceil_offset < 0)
949 ceil_offset = min_offset - 2;
950
951 if (min_offset && min_offset == dir->len &&
952 !is_dir_sep(dir->buf[min_offset - 1])) {
953 strbuf_addch(dir, '/');
954 min_offset++;
955 }
956
957 /*
958 * Test in the following order (relative to the dir):
959 * - .git (file containing "gitdir: <path>")
960 * - .git/
961 * - ./ (bare)
962 * - ../.git
963 * - ../.git/
964 * - ../ (bare)
965 * - ../../.git
966 * etc.
967 */
968 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
969 if (one_filesystem)
970 current_device = get_device_or_die(dir->buf, NULL, 0);
971 for (;;) {
972 int offset = dir->len, error_code = 0;
973
974 if (offset > min_offset)
975 strbuf_addch(dir, '/');
976 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
977 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
978 NULL : &error_code);
979 if (!gitdirenv) {
980 if (die_on_error ||
981 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
982 /* NEEDSWORK: fail if .git is not file nor dir */
983 if (is_git_directory(dir->buf))
984 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
985 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
986 return GIT_DIR_INVALID_GITFILE;
987 }
988 strbuf_setlen(dir, offset);
989 if (gitdirenv) {
990 strbuf_addstr(gitdir, gitdirenv);
991 return GIT_DIR_DISCOVERED;
992 }
993
994 if (is_git_directory(dir->buf)) {
995 strbuf_addstr(gitdir, ".");
996 return GIT_DIR_BARE;
997 }
998
999 if (offset <= min_offset)
1000 return GIT_DIR_HIT_CEILING;
1001
1002 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
1003 ; /* continue */
1004 if (offset <= ceil_offset)
1005 return GIT_DIR_HIT_CEILING;
1006
1007 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
1008 if (one_filesystem &&
1009 current_device != get_device_or_die(dir->buf, NULL, offset))
1010 return GIT_DIR_HIT_MOUNT_POINT;
1011 }
1012 }
1013
1014 int discover_git_directory(struct strbuf *commondir,
1015 struct strbuf *gitdir)
1016 {
1017 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
1018 size_t gitdir_offset = gitdir->len, cwd_len;
1019 size_t commondir_offset = commondir->len;
1020 struct repository_format candidate = REPOSITORY_FORMAT_INIT;
1021
1022 if (strbuf_getcwd(&dir))
1023 return -1;
1024
1025 cwd_len = dir.len;
1026 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
1027 strbuf_release(&dir);
1028 return -1;
1029 }
1030
1031 /*
1032 * The returned gitdir is relative to dir, and if dir does not reflect
1033 * the current working directory, we simply make the gitdir absolute.
1034 */
1035 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
1036 /* Avoid a trailing "/." */
1037 if (!strcmp(".", gitdir->buf + gitdir_offset))
1038 strbuf_setlen(gitdir, gitdir_offset);
1039 else
1040 strbuf_addch(&dir, '/');
1041 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1042 }
1043
1044 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1045
1046 strbuf_reset(&dir);
1047 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
1048 read_repository_format(&candidate, dir.buf);
1049 strbuf_release(&dir);
1050
1051 if (verify_repository_format(&candidate, &err) < 0) {
1052 warning("ignoring git dir '%s': %s",
1053 gitdir->buf + gitdir_offset, err.buf);
1054 strbuf_release(&err);
1055 strbuf_setlen(commondir, commondir_offset);
1056 strbuf_setlen(gitdir, gitdir_offset);
1057 clear_repository_format(&candidate);
1058 return -1;
1059 }
1060
1061 clear_repository_format(&candidate);
1062 return 0;
1063 }
1064
1065 const char *setup_git_directory_gently(int *nongit_ok)
1066 {
1067 static struct strbuf cwd = STRBUF_INIT;
1068 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
1069 const char *prefix = NULL;
1070 struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
1071
1072 /*
1073 * We may have read an incomplete configuration before
1074 * setting-up the git directory. If so, clear the cache so
1075 * that the next queries to the configuration reload complete
1076 * configuration (including the per-repo config file that we
1077 * ignored previously).
1078 */
1079 git_config_clear();
1080
1081 /*
1082 * Let's assume that we are in a git repository.
1083 * If it turns out later that we are somewhere else, the value will be
1084 * updated accordingly.
1085 */
1086 if (nongit_ok)
1087 *nongit_ok = 0;
1088
1089 if (strbuf_getcwd(&cwd))
1090 die_errno(_("Unable to read current working directory"));
1091 strbuf_addbuf(&dir, &cwd);
1092
1093 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
1094 case GIT_DIR_EXPLICIT:
1095 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok);
1096 break;
1097 case GIT_DIR_DISCOVERED:
1098 if (dir.len < cwd.len && chdir(dir.buf))
1099 die(_("cannot change to '%s'"), dir.buf);
1100 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1101 &repo_fmt, nongit_ok);
1102 break;
1103 case GIT_DIR_BARE:
1104 if (dir.len < cwd.len && chdir(dir.buf))
1105 die(_("cannot change to '%s'"), dir.buf);
1106 prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok);
1107 break;
1108 case GIT_DIR_HIT_CEILING:
1109 if (!nongit_ok)
1110 die(_("not a git repository (or any of the parent directories): %s"),
1111 DEFAULT_GIT_DIR_ENVIRONMENT);
1112 *nongit_ok = 1;
1113 break;
1114 case GIT_DIR_HIT_MOUNT_POINT:
1115 if (!nongit_ok)
1116 die(_("not a git repository (or any parent up to mount point %s)\n"
1117 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1118 dir.buf);
1119 *nongit_ok = 1;
1120 break;
1121 case GIT_DIR_NONE:
1122 /*
1123 * As a safeguard against setup_git_directory_gently_1 returning
1124 * this value, fallthrough to BUG. Otherwise it is possible to
1125 * set startup_info->have_repository to 1 when we did nothing to
1126 * find a repository.
1127 */
1128 default:
1129 BUG("unhandled setup_git_directory_1() result");
1130 }
1131
1132 /*
1133 * At this point, nongit_ok is stable. If it is non-NULL and points
1134 * to a non-zero value, then this means that we haven't found a
1135 * repository and that the caller expects startup_info to reflect
1136 * this.
1137 *
1138 * Regardless of the state of nongit_ok, startup_info->prefix and
1139 * the GIT_PREFIX environment variable must always match. For details
1140 * see Documentation/config/alias.txt.
1141 */
1142 if (nongit_ok && *nongit_ok) {
1143 startup_info->have_repository = 0;
1144 startup_info->prefix = NULL;
1145 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1146 } else {
1147 startup_info->have_repository = 1;
1148 startup_info->prefix = prefix;
1149 if (prefix)
1150 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1151 else
1152 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1153 }
1154
1155 /*
1156 * Not all paths through the setup code will call 'set_git_dir()' (which
1157 * directly sets up the environment) so in order to guarantee that the
1158 * environment is in a consistent state after setup, explicitly setup
1159 * the environment if we have a repository.
1160 *
1161 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some
1162 * code paths so we also need to explicitly setup the environment if
1163 * the user has set GIT_DIR. It may be beneficial to disallow bogus
1164 * GIT_DIR values at some point in the future.
1165 */
1166 if (/* GIT_DIR_EXPLICIT, GIT_DIR_DISCOVERED, GIT_DIR_BARE */
1167 startup_info->have_repository ||
1168 /* GIT_DIR_EXPLICIT */
1169 getenv(GIT_DIR_ENVIRONMENT)) {
1170 if (!the_repository->gitdir) {
1171 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1172 if (!gitdir)
1173 gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
1174 setup_git_env(gitdir);
1175 }
1176 if (startup_info->have_repository)
1177 repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
1178 }
1179
1180 strbuf_release(&dir);
1181 strbuf_release(&gitdir);
1182 clear_repository_format(&repo_fmt);
1183
1184 return prefix;
1185 }
1186
1187 int git_config_perm(const char *var, const char *value)
1188 {
1189 int i;
1190 char *endptr;
1191
1192 if (value == NULL)
1193 return PERM_GROUP;
1194
1195 if (!strcmp(value, "umask"))
1196 return PERM_UMASK;
1197 if (!strcmp(value, "group"))
1198 return PERM_GROUP;
1199 if (!strcmp(value, "all") ||
1200 !strcmp(value, "world") ||
1201 !strcmp(value, "everybody"))
1202 return PERM_EVERYBODY;
1203
1204 /* Parse octal numbers */
1205 i = strtol(value, &endptr, 8);
1206
1207 /* If not an octal number, maybe true/false? */
1208 if (*endptr != 0)
1209 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1210
1211 /*
1212 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
1213 * a chmod value to restrict to.
1214 */
1215 switch (i) {
1216 case PERM_UMASK: /* 0 */
1217 return PERM_UMASK;
1218 case OLD_PERM_GROUP: /* 1 */
1219 return PERM_GROUP;
1220 case OLD_PERM_EVERYBODY: /* 2 */
1221 return PERM_EVERYBODY;
1222 }
1223
1224 /* A filemode value was given: 0xxx */
1225
1226 if ((i & 0600) != 0600)
1227 die(_("problem with core.sharedRepository filemode value "
1228 "(0%.3o).\nThe owner of files must always have "
1229 "read and write permissions."), i);
1230
1231 /*
1232 * Mask filemode value. Others can not get write permission.
1233 * x flags for directories are handled separately.
1234 */
1235 return -(i & 0666);
1236 }
1237
1238 void check_repository_format(void)
1239 {
1240 struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
1241 check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
1242 startup_info->have_repository = 1;
1243 clear_repository_format(&repo_fmt);
1244 }
1245
1246 /*
1247 * Returns the "prefix", a path to the current working directory
1248 * relative to the work tree root, or NULL, if the current working
1249 * directory is not a strict subdirectory of the work tree root. The
1250 * prefix always ends with a '/' character.
1251 */
1252 const char *setup_git_directory(void)
1253 {
1254 return setup_git_directory_gently(NULL);
1255 }
1256
1257 const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
1258 {
1259 if (is_git_directory(suspect))
1260 return suspect;
1261 return read_gitfile_gently(suspect, return_error_code);
1262 }
1263
1264 /* if any standard file descriptor is missing open it to /dev/null */
1265 void sanitize_stdfds(void)
1266 {
1267 int fd = open("/dev/null", O_RDWR, 0);
1268 while (fd != -1 && fd < 2)
1269 fd = dup(fd);
1270 if (fd == -1)
1271 die_errno(_("open /dev/null or dup failed"));
1272 if (fd > 2)
1273 close(fd);
1274 }
1275
1276 int daemonize(void)
1277 {
1278 #ifdef NO_POSIX_GOODIES
1279 errno = ENOSYS;
1280 return -1;
1281 #else
1282 switch (fork()) {
1283 case 0:
1284 break;
1285 case -1:
1286 die_errno(_("fork failed"));
1287 default:
1288 exit(0);
1289 }
1290 if (setsid() == -1)
1291 die_errno(_("setsid failed"));
1292 close(0);
1293 close(1);
1294 close(2);
1295 sanitize_stdfds();
1296 return 0;
1297 #endif
1298 }