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